<?php
// by Edd Dumbill (C) 1999-2002
// <edd@usefulinc.com>
// $Id: xmlrpc.inc,v 1.174 2009/03/16 19:36:38 ggiunta Exp $

// Copyright (c) 1999,2000,2002 Edd Dumbill.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//    * Redistributions of source code must retain the above copyright
//      notice, this list of conditions and the following disclaimer.
//
//    * Redistributions in binary form must reproduce the above
//      copyright notice, this list of conditions and the following
//      disclaimer in the documentation and/or other materials provided
//      with the distribution.
//
//    * Neither the name of the "XML-RPC for PHP" nor the names of its
//      contributors may be used to endorse or promote products derived
//      from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.

    if(!function_exists('xml_parser_create'))
    {
        // For PHP 4 onward, XML functionality is always compiled-in on windows:
        // no more need to dl-open it. It might have been compiled out on *nix...
        if(strtoupper(substr(PHP_OS, 0, 3) != 'WIN'))
        {
            dl('xml.so');
        }
    }

    // G. Giunta 2005/01/29: declare global these variables,
    // so that xmlrpc.inc will work even if included from within a function
    // Milosch: 2005/08/07 - explicitly request these via $GLOBALS where used.
    $GLOBALS['xmlrpcI4']='i4';
    $GLOBALS['xmlrpcInt']='int';
    $GLOBALS['xmlrpcBoolean']='boolean';
    $GLOBALS['xmlrpcDouble']='double';
    $GLOBALS['xmlrpcString']='string';
    $GLOBALS['xmlrpcDateTime']='dateTime.iso8601';
    $GLOBALS['xmlrpcBase64']='base64';
    $GLOBALS['xmlrpcArray']='array';
    $GLOBALS['xmlrpcStruct']='struct';
    $GLOBALS['xmlrpcValue']='undefined';

    $GLOBALS['xmlrpcTypes']=array(
        $GLOBALS['xmlrpcI4']       => 1,
        $GLOBALS['xmlrpcInt']      => 1,
        $GLOBALS['xmlrpcBoolean']  => 1,
        $GLOBALS['xmlrpcString']   => 1,
        $GLOBALS['xmlrpcDouble']   => 1,
        $GLOBALS['xmlrpcDateTime'] => 1,
        $GLOBALS['xmlrpcBase64']   => 1,
        $GLOBALS['xmlrpcArray']    => 2,
        $GLOBALS['xmlrpcStruct']   => 3
    );

    $GLOBALS['xmlrpc_valid_parents'] = array(
        'VALUE' => array('MEMBER', 'DATA', 'PARAM', 'FAULT'),
        'BOOLEAN' => array('VALUE'),
        'I4' => array('VALUE'),
        'INT' => array('VALUE'),
        'STRING' => array('VALUE'),
        'DOUBLE' => array('VALUE'),
        'DATETIME.ISO8601' => array('VALUE'),
        'BASE64' => array('VALUE'),
        'MEMBER' => array('STRUCT'),
        'NAME' => array('MEMBER'),
        'DATA' => array('ARRAY'),
        'ARRAY' => array('VALUE'),
        'STRUCT' => array('VALUE'),
        'PARAM' => array('PARAMS'),
        'METHODNAME' => array('METHODCALL'),
        'PARAMS' => array('METHODCALL', 'METHODRESPONSE'),
        'FAULT' => array('METHODRESPONSE'),
        'NIL' => array('VALUE'), // only used when extension activated
        'EX:NIL' => array('VALUE') // only used when extension activated
    );

    // define extra types for supporting NULL (useful for json or <NIL/>)
    $GLOBALS['xmlrpcNull']='null';
    $GLOBALS['xmlrpcTypes']['null']=1;

    // Not in use anymore since 2.0. Shall we remove it?
    /// @deprecated
    $GLOBALS['xmlEntities']=array(
        'amp'  => '&',
        'quot' => '"',
        'lt'   => '<',
        'gt'   => '>',
        'apos' => "'"
    );

    // tables used for transcoding different charsets into us-ascii xml

    $GLOBALS['xml_iso88591_Entities']=array();
    $GLOBALS['xml_iso88591_Entities']['in'] = array();
    $GLOBALS['xml_iso88591_Entities']['out'] = array();
    for ($i = 0; $i < 32; $i++)
    {
        $GLOBALS['xml_iso88591_Entities']['in'][] = chr($i);
        $GLOBALS['xml_iso88591_Entities']['out'][] = '&#'.$i.';';
    }
    for ($i = 160; $i < 256; $i++)
    {
        $GLOBALS['xml_iso88591_Entities']['in'][] = chr($i);
        $GLOBALS['xml_iso88591_Entities']['out'][] = '&#'.$i.';';
    }

    /// @todo add to iso table the characters from cp_1252 range, i.e. 128 to 159?
    /// These will NOT be present in true ISO-8859-1, but will save the unwary
    /// windows user from sending junk (though no luck when reciving them...)
  /*
    $GLOBALS['xml_cp1252_Entities']=array();
    for ($i = 128; $i < 160; $i++)
    {
        $GLOBALS['xml_cp1252_Entities']['in'][] = chr($i);
    }
    $GLOBALS['xml_cp1252_Entities']['out'] = array(
        '&#x20AC;', '?',        '&#x201A;', '&#x0192;',
        '&#x201E;', '&#x2026;', '&#x2020;', '&#x2021;',
        '&#x02C6;', '&#x2030;', '&#x0160;', '&#x2039;',
        '&#x0152;', '?',        '&#x017D;', '?',
        '?',        '&#x2018;', '&#x2019;', '&#x201C;',
        '&#x201D;', '&#x2022;', '&#x2013;', '&#x2014;',
        '&#x02DC;', '&#x2122;', '&#x0161;', '&#x203A;',
        '&#x0153;', '?',        '&#x017E;', '&#x0178;'
    );
  */

    $GLOBALS['xmlrpcerr'] = array(
    'unknown_method'=>1,
    'invalid_return'=>2,
    'incorrect_params'=>3,
    'introspect_unknown'=>4,
    'http_error'=>5,
    'no_data'=>6,
    'no_ssl'=>7,
    'curl_fail'=>8,
    'invalid_request'=>15,
    'no_curl'=>16,
    'server_error'=>17,
    'multicall_error'=>18,
    'multicall_notstruct'=>9,
    'multicall_nomethod'=>10,
    'multicall_notstring'=>11,
    'multicall_recursion'=>12,
    'multicall_noparams'=>13,
    'multicall_notarray'=>14,

    'cannot_decompress'=>103,
    'decompress_fail'=>104,
    'dechunk_fail'=>105,
    'server_cannot_decompress'=>106,
    'server_decompress_fail'=>107
    );

    $GLOBALS['xmlrpcstr'] = array(
    'unknown_method'=>'Unknown method',
    'invalid_return'=>'Invalid return payload: enable debugging to examine incoming payload',
    'incorrect_params'=>'Incorrect parameters passed to method',
    'introspect_unknown'=>"Can't introspect: method unknown",
    'http_error'=>"Didn't receive 200 OK from remote server.",
    'no_data'=>'No data received from server.',
    'no_ssl'=>'No SSL support compiled in.',
    'curl_fail'=>'CURL error',
    'invalid_request'=>'Invalid request payload',
    'no_curl'=>'No CURL support compiled in.',
    'server_error'=>'Internal server error',
    'multicall_error'=>'Received from server invalid multicall response',
    'multicall_notstruct'=>'system.multicall expected struct',
    'multicall_nomethod'=>'missing methodName',
    'multicall_notstring'=>'methodName is not a string',
    'multicall_recursion'=>'recursive system.multicall forbidden',
    'multicall_noparams'=>'missing params',
    'multicall_notarray'=>'params is not an array',

    'cannot_decompress'=>'Received from server compressed HTTP and cannot decompress',
    'decompress_fail'=>'Received from server invalid compressed HTTP',
    'dechunk_fail'=>'Received from server invalid chunked HTTP',
    'server_cannot_decompress'=>'Received from client compressed HTTP request and cannot decompress',
    'server_decompress_fail'=>'Received from client invalid compressed HTTP request'
    );

    // The charset encoding used by the server for received messages and
    // by the client for received responses when received charset cannot be determined
    // or is not supported
    $GLOBALS['xmlrpc_defencoding']='UTF-8';

    // The encoding used internally by PHP.
    // String values received as xml will be converted to this, and php strings will be converted to xml
    // as if having been coded with this
    $GLOBALS['xmlrpc_internalencoding']='UTF-8';

    $GLOBALS['xmlrpcName']='XML-RPC for PHP';
    $GLOBALS['xmlrpcVersion']='3.0.0.beta';

    // let user errors start at 800
    $GLOBALS['xmlrpcerruser']=800;
    // let XML parse errors start at 100
    $GLOBALS['xmlrpcerrxml']=100;

    // formulate backslashes for escaping regexp
    // Not in use anymore since 2.0. Shall we remove it?
    /// @deprecated
    $GLOBALS['xmlrpc_backslash']=chr(92).chr(92);

    // set to TRUE to enable correct decoding of <NIL/> and <EX:NIL/> values
    $GLOBALS['xmlrpc_null_extension']=false;

    // set to TRUE to enable encoding of php NULL values to <EX:NIL/> instead of <NIL/>
    $GLOBALS['xmlrpc_null_apache_encoding']=false;

    // used to store state during parsing
    // quick explanation of components:
    //   ac - used to accumulate values
    //   isf - used to indicate a parsing fault (2) or xmlrpcresp fault (1)
    //   isf_reason - used for storing xmlrpcresp fault string
    //   lv - used to indicate "looking for a value": implements
    //        the logic to allow values with no types to be strings
    //   params - used to store parameters in method calls
    //   method - used to store method name
    //   stack - array with genealogy of xml elements names:
    //           used to validate nesting of xmlrpc elements
    $GLOBALS['_xh']=null;

    /**
    * Convert a string to the correct XML representation in a target charset
    * To help correct communication of non-ascii chars inside strings, regardless
    * of the charset used when sending requests, parsing them, sending responses
    * and parsing responses, an option is to convert all non-ascii chars present in the message
    * into their equivalent 'charset entity'. Charset entities enumerated this way
    * are independent of the charset encoding used to transmit them, and all XML
    * parsers are bound to understand them.
    * Note that in the std case we are not sending a charset encoding mime type
    * along with http headers, so we are bound by RFC 3023 to emit strict us-ascii.
    *
    * @todo do a bit of basic benchmarking (strtr vs. str_replace)
    * @todo make usage of iconv() or recode_string() or mb_string() where available
    */
    function xmlrpc_encode_entitites($data, $src_encoding='', $dest_encoding='')
    {
        if ($src_encoding == '')
        {
            // lame, but we know no better...
            $src_encoding = $GLOBALS['xmlrpc_internalencoding'];
        }

        switch(strtoupper($src_encoding.'_'.$dest_encoding))
        {
            case 'ISO-8859-1_':
            case 'ISO-8859-1_US-ASCII':
                $escaped_data = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                $escaped_data = str_replace($GLOBALS['xml_iso88591_Entities']['in'], $GLOBALS['xml_iso88591_Entities']['out'], $escaped_data);
                break;
            case 'ISO-8859-1_UTF-8':
                $escaped_data = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                $escaped_data = utf8_encode($escaped_data);
                break;
            case 'ISO-8859-1_ISO-8859-1':
            case 'US-ASCII_US-ASCII':
            case 'US-ASCII_UTF-8':
            case 'US-ASCII_':
            case 'US-ASCII_ISO-8859-1':
            case 'UTF-8_UTF-8':
            //case 'CP1252_CP1252':
                $escaped_data = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                break;
            case 'UTF-8_':
            case 'UTF-8_US-ASCII':
            case 'UTF-8_ISO-8859-1':
    // NB: this will choke on invalid UTF-8, going most likely beyond EOF
    $escaped_data = '';
    // be kind to users creating string xmlrpcvals out of different php types
    $data = (string) $data;
    $ns = strlen ($data);
    for ($nn = 0; $nn < $ns; $nn++)
    {
        $ch = $data[$nn];
        $ii = ord($ch);
        //1 7 0bbbbbbb (127)
        if ($ii < 128)
        {
            /// @todo shall we replace this with a (supposedly) faster str_replace?
            switch($ii){
                case 34:
                    $escaped_data .= '&quot;';
                    break;
                case 38:
                    $escaped_data .= '&amp;';
                    break;
                case 39:
                    $escaped_data .= '&apos;';
                    break;
                case 60:
                    $escaped_data .= '&lt;';
                    break;
                case 62:
                    $escaped_data .= '&gt;';
                    break;
                default:
                    $escaped_data .= $ch;
            } // switch
        }
        //2 11 110bbbbb 10bbbbbb (2047)
        else if ($ii>>5 == 6)
        {
            $b1 = ($ii & 31);
            $ii = ord($data[$nn+1]);
            $b2 = ($ii & 63);
            $ii = ($b1 * 64) + $b2;
            $ent = sprintf ('&#%d;', $ii);
            $escaped_data .= $ent;
            $nn += 1;
        }
        //3 16 1110bbbb 10bbbbbb 10bbbbbb
        else if ($ii>>4 == 14)
        {
            $b1 = ($ii & 15);
            $ii = ord($data[$nn+1]);
            $b2 = ($ii & 63);
            $ii = ord($data[$nn+2]);
            $b3 = ($ii & 63);
            $ii = ((($b1 * 64) + $b2) * 64) + $b3;
            $ent = sprintf ('&#%d;', $ii);
            $escaped_data .= $ent;
            $nn += 2;
        }
        //4 21 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
        else if ($ii>>3 == 30)
        {
            $b1 = ($ii & 7);
            $ii = ord($data[$nn+1]);
            $b2 = ($ii & 63);
            $ii = ord($data[$nn+2]);
            $b3 = ($ii & 63);
            $ii = ord($data[$nn+3]);
            $b4 = ($ii & 63);
            $ii = ((((($b1 * 64) + $b2) * 64) + $b3) * 64) + $b4;
            $ent = sprintf ('&#%d;', $ii);
            $escaped_data .= $ent;
            $nn += 3;
        }
    }
                break;
/*
            case 'CP1252_':
            case 'CP1252_US-ASCII':
                $escaped_data = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                $escaped_data = str_replace($GLOBALS['xml_iso88591_Entities']['in'], $GLOBALS['xml_iso88591_Entities']['out'], $escaped_data);
                $escaped_data = str_replace($GLOBALS['xml_cp1252_Entities']['in'], $GLOBALS['xml_cp1252_Entities']['out'], $escaped_data);
                break;
            case 'CP1252_UTF-8':
                $escaped_data = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                /// @todo we could use real UTF8 chars here instead of xml entities... (note that utf_8 encode all allone will NOT convert them)
                $escaped_data = str_replace($GLOBALS['xml_cp1252_Entities']['in'], $GLOBALS['xml_cp1252_Entities']['out'], $escaped_data);
                $escaped_data = utf8_encode($escaped_data);
                break;
            case 'CP1252_ISO-8859-1':
                $escaped_data = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                // we might as well replave all funky chars with a '?' here, but we are kind and leave it to the receiving application layer to decide what to do with these weird entities...
                $escaped_data = str_replace($GLOBALS['xml_cp1252_Entities']['in'], $GLOBALS['xml_cp1252_Entities']['out'], $escaped_data);
                break;
*/
            default:
                $escaped_data = '';
                error_log("Converting from $src_encoding to $dest_encoding: not supported...");
        }
        return $escaped_data;
    }

    /// xml parser handler function for opening element tags
    function xmlrpc_se($parser, $name, $attrs, $accept_single_vals=false)
    {
        // if invalid xmlrpc already detected, skip all processing
        if ($GLOBALS['_xh']['isf'] < 2)
        {
            // check for correct element nesting
            // top level element can only be of 2 types
            /// @todo optimization creep: save this check into a bool variable, instead of using count() every time:
            ///       there is only a single top level element in xml anyway
            if (count($GLOBALS['_xh']['stack']) == 0)
            {
                if ($name != 'METHODRESPONSE' && $name != 'METHODCALL' && (
                    $name != 'VALUE' && !$accept_single_vals))
                {
                    $GLOBALS['_xh']['isf'] = 2;
                    $GLOBALS['_xh']['isf_reason'] = 'missing top level xmlrpc element';
                    return;
                }
                else
                {
                    $GLOBALS['_xh']['rt'] = strtolower($name);
                    $GLOBALS['_xh']['rt'] = strtolower($name);
                }
            }
            else
            {
                // not top level element: see if parent is OK
                $parent = end($GLOBALS['_xh']['stack']);
                if (!array_key_exists($name, $GLOBALS['xmlrpc_valid_parents']) || !in_array($parent, $GLOBALS['xmlrpc_valid_parents'][$name]))
                {
                    $GLOBALS['_xh']['isf'] = 2;
                    $GLOBALS['_xh']['isf_reason'] = "xmlrpc element $name cannot be child of $parent";
                    return;
                }
            }

            switch($name)
            {
                // optimize for speed switch cases: most common cases first
                case 'VALUE':
                    /// @todo we could check for 2 VALUE elements inside a MEMBER or PARAM element
                    $GLOBALS['_xh']['vt']='value'; // indicator: no value found yet
                    $GLOBALS['_xh']['ac']='';
                    $GLOBALS['_xh']['lv']=1;
                    $GLOBALS['_xh']['php_class']=null;
                    break;
                case 'I4':
                case 'INT':
                case 'STRING':
                case 'BOOLEAN':
                case 'DOUBLE':
                case 'DATETIME.ISO8601':
                case 'BASE64':
                    if ($GLOBALS['_xh']['vt']!='value')
                    {
                        //two data elements inside a value: an error occurred!
                        $GLOBALS['_xh']['isf'] = 2;
                        $GLOBALS['_xh']['isf_reason'] = "$name element following a {$GLOBALS['_xh']['vt']} element inside a single value";
                        return;
                    }
                    $GLOBALS['_xh']['ac']=''; // reset the accumulator
                    break;
                case 'STRUCT':
                case 'ARRAY':
                    if ($GLOBALS['_xh']['vt']!='value')
                    {
                        //two data elements inside a value: an error occurred!
                        $GLOBALS['_xh']['isf'] = 2;
                        $GLOBALS['_xh']['isf_reason'] = "$name element following a {$GLOBALS['_xh']['vt']} element inside a single value";
                        return;
                    }
                    // create an empty array to hold child values, and push it onto appropriate stack
                    $cur_val = array();
                    $cur_val['values'] = array();
                    $cur_val['type'] = $name;
                    // check for out-of-band information to rebuild php objs
                    // and in case it is found, save it
                    if (@isset($attrs['PHP_CLASS']))
                    {
                        $cur_val['php_class'] = $attrs['PHP_CLASS'];
                    }
                    $GLOBALS['_xh']['valuestack'][] = $cur_val;
                    $GLOBALS['_xh']['vt']='data'; // be prepared for a data element next
                    break;
                case 'DATA':
                    if ($GLOBALS['_xh']['vt']!='data')
                    {
                        //two data elements inside a value: an error occurred!
                        $GLOBALS['_xh']['isf'] = 2;
                        $GLOBALS['_xh']['isf_reason'] = "found two data elements inside an array element";
                        return;
                    }
                case 'METHODCALL':
                case 'METHODRESPONSE':
                case 'PARAMS':
                    // valid elements that add little to processing
                    break;
                case 'METHODNAME':
                case 'NAME':
                    /// @todo we could check for 2 NAME elements inside a MEMBER element
                    $GLOBALS['_xh']['ac']='';
                    break;
                case 'FAULT':
                    $GLOBALS['_xh']['isf']=1;
                    break;
                case 'MEMBER':
                    $GLOBALS['_xh']['valuestack'][count($GLOBALS['_xh']['valuestack'])-1]['name']=''; // set member name to null, in case we do not find in the xml later on
                    //$GLOBALS['_xh']['ac']='';
                    // Drop trough intentionally
                case 'PARAM':
                    // clear value type, so we can check later if no value has been passed for this param/member
                    $GLOBALS['_xh']['vt']=null;
                    break;
                case 'NIL':
                case 'EX:NIL':
                    if ($GLOBALS['xmlrpc_null_extension'])
                    {
                        if ($GLOBALS['_xh']['vt']!='value')
                        {
                            //two data elements inside a value: an error occurred!
                            $GLOBALS['_xh']['isf'] = 2;
                            $GLOBALS['_xh']['isf_reason'] = "$name element following a {$GLOBALS['_xh']['vt']} element inside a single value";
                            return;
                        }
                        $GLOBALS['_xh']['ac']=''; // reset the accumulator
                        break;
                    }
                    // we do not support the <NIL/> extension, so
                    // drop through intentionally
                default:
                    /// INVALID ELEMENT: RAISE ISF so that it is later recognized!!!
                    $GLOBALS['_xh']['isf'] = 2;
                    $GLOBALS['_xh']['isf_reason'] = "found not-xmlrpc xml element $name";
                    break;
            }

            // Save current element name to stack, to validate nesting
            $GLOBALS['_xh']['stack'][] = $name;

            /// @todo optimization creep: move this inside the big switch() above
            if($name!='VALUE')
            {
                $GLOBALS['_xh']['lv']=0;
            }
        }
    }

    /// Used in decoding xml chunks that might represent single xmlrpc values
    function xmlrpc_se_any($parser, $name, $attrs)
    {
        xmlrpc_se($parser, $name, $attrs, true);
    }

    /// xml parser handler function for close element tags
    function xmlrpc_ee($parser, $name, $rebuild_xmlrpcvals = true)
    {
        if ($GLOBALS['_xh']['isf'] < 2)
        {
            // push this element name from stack
            // NB: if XML validates, correct opening/closing is guaranteed and
            // we do not have to check for $name == $curr_elem.
            // we also checked for proper nesting at start of elements...
            $curr_elem = array_pop($GLOBALS['_xh']['stack']);

            switch($name)
            {
                case 'VALUE':
                    // This if() detects if no scalar was inside <VALUE></VALUE>
                    if ($GLOBALS['_xh']['vt']=='value')
                    {
                        $GLOBALS['_xh']['value']=$GLOBALS['_xh']['ac'];
                        $GLOBALS['_xh']['vt']=$GLOBALS['xmlrpcString'];
                    }

                    if ($rebuild_xmlrpcvals)
                    {
                        // build the xmlrpc val out of the data received, and substitute it
                        $temp = new xmlrpcval($GLOBALS['_xh']['value'], $GLOBALS['_xh']['vt']);
                        // in case we got info about underlying php class, save it
                        // in the object we're rebuilding
                        if (isset($GLOBALS['_xh']['php_class']))
                            $temp->_php_class = $GLOBALS['_xh']['php_class'];
                        // check if we are inside an array or struct:
                        // if value just built is inside an array, let's move it into array on the stack
                        $vscount = count($GLOBALS['_xh']['valuestack']);
                        if ($vscount && $GLOBALS['_xh']['valuestack'][$vscount-1]['type']=='ARRAY')
                        {
                            $GLOBALS['_xh']['valuestack'][$vscount-1]['values'][] = $temp;
                        }
                        else
                        {
                            $GLOBALS['_xh']['value'] = $temp;
                        }
                    }
                    else
                    {
                        /// @todo this needs to treat correctly php-serialized objects,
                        /// since std deserializing is done by php_xmlrpc_decode,
                        /// which we will not be calling...
                        if (isset($GLOBALS['_xh']['php_class']))
                        {
                        }

                        // check if we are inside an array or struct:
                        // if value just built is inside an array, let's move it into array on the stack
                        $vscount = count($GLOBALS['_xh']['valuestack']);
                        if ($vscount && $GLOBALS['_xh']['valuestack'][$vscount-1]['type']=='ARRAY')
                        {
                            $GLOBALS['_xh']['valuestack'][$vscount-1]['values'][] = $GLOBALS['_xh']['value'];
                        }
                    }
                    break;
                case 'BOOLEAN':
                case 'I4':
                case 'INT':
                case 'STRING':
                case 'DOUBLE':
                case 'DATETIME.ISO8601':
                case 'BASE64':
                    $GLOBALS['_xh']['vt']=strtolower($name);
                    /// @todo: optimization creep - remove the if/elseif cycle below
                    /// since the case() in which we are already did that
                    if ($name=='STRING')
                    {
                        $GLOBALS['_xh']['value']=$GLOBALS['_xh']['ac'];
                    }
                    elseif ($name=='DATETIME.ISO8601')
                    {
                        if (!preg_match('/^[0-9]{8}T[0-9]{2}:[0-9]{2}:[0-9]{2}$/', $GLOBALS['_xh']['ac']))
                        {
                            error_log('XML-RPC: invalid value received in DATETIME: '.$GLOBALS['_xh']['ac']);
                        }
                        $GLOBALS['_xh']['vt']=$GLOBALS['xmlrpcDateTime'];
                        $GLOBALS['_xh']['value']=$GLOBALS['_xh']['ac'];
                    }
                    elseif ($name=='BASE64')
                    {
                        /// @todo check for failure of base64 decoding / catch warnings
                        $GLOBALS['_xh']['value']=base64_decode($GLOBALS['_xh']['ac']);
                    }
                    elseif ($name=='BOOLEAN')
                    {
                        // special case here: we translate boolean 1 or 0 into PHP
                        // constants true or false.
                        // Strings 'true' and 'false' are accepted, even though the
                        // spec never mentions them (see eg. Blogger api docs)
                        // NB: this simple checks helps a lot sanitizing input, ie no
                        // security problems around here
                        if ($GLOBALS['_xh']['ac']=='1' || strcasecmp($GLOBALS['_xh']['ac'], 'true') == 0)
                        {
                            $GLOBALS['_xh']['value']=true;
                        }
                        else
                        {
                            // log if receiveing something strange, even though we set the value to false anyway
                            if ($GLOBALS['_xh']['ac']!='0' && strcasecmp($GLOBALS['_xh']['ac'], 'false') != 0)
                                error_log('XML-RPC: invalid value received in BOOLEAN: '.$GLOBALS['_xh']['ac']);
                            $GLOBALS['_xh']['value']=false;
                        }
                    }
                    elseif ($name=='DOUBLE')
                    {
                        // we have a DOUBLE
                        // we must check that only 0123456789-.<space> are characters here
                        // NOTE: regexp could be much stricter than this...
                        if (!preg_match('/^[+-eE0123456789 \t.]+$/', $GLOBALS['_xh']['ac']))
                        {
                            /// @todo: find a better way of throwing an error than this!
                            error_log('XML-RPC: non numeric value received in DOUBLE: '.$GLOBALS['_xh']['ac']);
                            $GLOBALS['_xh']['value']='ERROR_NON_NUMERIC_FOUND';
                        }
                        else
                        {
                            // it's ok, add it on
                            $GLOBALS['_xh']['value']=(double)$GLOBALS['_xh']['ac'];
                        }
                    }
                    else
                    {
                        // we have an I4/INT
                        // we must check that only 0123456789-<space> are characters here
                        if (!preg_match('/^[+-]?[0123456789 \t]+$/', $GLOBALS['_xh']['ac']))
                        {
                            /// @todo find a better way of throwing an error than this!
                            error_log('XML-RPC: non numeric value received in INT: '.$GLOBALS['_xh']['ac']);
                            $GLOBALS['_xh']['value']='ERROR_NON_NUMERIC_FOUND';
                        }
                        else
                        {
                            // it's ok, add it on
                            $GLOBALS['_xh']['value']=(int)$GLOBALS['_xh']['ac'];
                        }
                    }
                    //$GLOBALS['_xh']['ac']=''; // is this necessary?
                    $GLOBALS['_xh']['lv']=3; // indicate we've found a value
                    break;
                case 'NAME':
                    $GLOBALS['_xh']['valuestack'][count($GLOBALS['_xh']['valuestack'])-1]['name'] = $GLOBALS['_xh']['ac'];
                    break;
                case 'MEMBER':
                    //$GLOBALS['_xh']['ac']=''; // is this necessary?
                    // add to array in the stack the last element built,
                    // unless no VALUE was found
                    if ($GLOBALS['_xh']['vt'])
                    {
                        $vscount = count($GLOBALS['_xh']['valuestack']);
                        $GLOBALS['_xh']['valuestack'][$vscount-1]['values'][$GLOBALS['_xh']['valuestack'][$vscount-1]['name']] = $GLOBALS['_xh']['value'];
                    } else
                        error_log('XML-RPC: missing VALUE inside STRUCT in received xml');
                    break;
                case 'DATA':
                    //$GLOBALS['_xh']['ac']=''; // is this necessary?
                    $GLOBALS['_xh']['vt']=null; // reset this to check for 2 data elements in a row - even if they're empty
                    break;
                case 'STRUCT':
                case 'ARRAY':
                    // fetch out of stack array of values, and promote it to current value
                    $curr_val = array_pop($GLOBALS['_xh']['valuestack']);
                    $GLOBALS['_xh']['value'] = $curr_val['values'];
                    $GLOBALS['_xh']['vt']=strtolower($name);
                    if (isset($curr_val['php_class']))
                    {
                        $GLOBALS['_xh']['php_class'] = $curr_val['php_class'];
                    }
                    break;
                case 'PARAM':
                    // add to array of params the current value,
                    // unless no VALUE was found
                    if ($GLOBALS['_xh']['vt'])
                    {
                        $GLOBALS['_xh']['params'][]=$GLOBALS['_xh']['value'];
                        $GLOBALS['_xh']['pt'][]=$GLOBALS['_xh']['vt'];
                    }
                    else
                        error_log('XML-RPC: missing VALUE inside PARAM in received xml');
                    break;
                case 'METHODNAME':
                    $GLOBALS['_xh']['method']=preg_replace('/^[\n\r\t ]+/', '', $GLOBALS['_xh']['ac']);
                    break;
                case 'NIL':
                case 'EX:NIL':
                    if ($GLOBALS['xmlrpc_null_extension'])
                    {
                        $GLOBALS['_xh']['vt']='null';
                        $GLOBALS['_xh']['value']=null;
                        $GLOBALS['_xh']['lv']=3;
                        break;
                    }
                    // drop through intentionally if nil extension not enabled
                case 'PARAMS':
                case 'FAULT':
                case 'METHODCALL':
                case 'METHORESPONSE':
                    break;
                default:
                    // End of INVALID ELEMENT!
                    // shall we add an assert here for unreachable code???
                    break;
            }
        }
    }

    /// Used in decoding xmlrpc requests/responses without rebuilding xmlrpc values
    function xmlrpc_ee_fast($parser, $name)
    {
        xmlrpc_ee($parser, $name, false);
    }

    /// xml parser handler function for character data
    function xmlrpc_cd($parser, $data)
    {
        // skip processing if xml fault already detected
        if ($GLOBALS['_xh']['isf'] < 2)
        {
            // "lookforvalue==3" means that we've found an entire value
            // and should discard any further character data
            if($GLOBALS['_xh']['lv']!=3)
            {
                // G. Giunta 2006-08-23: useless change of 'lv' from 1 to 2
                //if($GLOBALS['_xh']['lv']==1)
                //{
                    // if we've found text and we're just in a <value> then
                    // say we've found a value
                    //$GLOBALS['_xh']['lv']=2;
                //}
                // we always initialize the accumulator before starting parsing, anyway...
                //if(!@isset($GLOBALS['_xh']['ac']))
                //{
                //  $GLOBALS['_xh']['ac'] = '';
                //}
                $GLOBALS['_xh']['ac'].=$data;
            }
        }
    }

    /// xml parser handler function for 'other stuff', ie. not char data or
    /// element start/end tag. In fact it only gets called on unknown entities...
    function xmlrpc_dh($parser, $data)
    {
        // skip processing if xml fault already detected
        if ($GLOBALS['_xh']['isf'] < 2)
        {
            if(substr($data, 0, 1) == '&' && substr($data, -1, 1) == ';')
            {
                // G. Giunta 2006-08-25: useless change of 'lv' from 1 to 2
                //if($GLOBALS['_xh']['lv']==1)
                //{
                //  $GLOBALS['_xh']['lv']=2;
                //}
                $GLOBALS['_xh']['ac'].=$data;
            }
        }
        return true;
    }

    class xmlrpc_client
    {
        var $path;
        var $server;
        var $port=0;
        var $method='http';
        var $errno;
        var $errstr;
        var $debug=0;
        var $username='';
        var $password='';
        var $authtype=1;
        var $cert='';
        var $certpass='';
        var $cacert='';
        var $cacertdir='';
        var $key='';
        var $keypass='';
        var $verifypeer=true;
        var $verifyhost=1;
        var $no_multicall=false;
        var $proxy='';
        var $proxyport=0;
        var $proxy_user='';
        var $proxy_pass='';
        var $proxy_authtype=1;
        var $cookies=array();
        var $extracurlopts=array();

        /**
        * List of http compression methods accepted by the client for responses.
        * NB: PHP supports deflate, gzip compressions out of the box if compiled w. zlib
        *
        * NNB: you can set it to any non-empty array for HTTP11 and HTTPS, since
        * in those cases it will be up to CURL to decide the compression methods
        * it supports. You might check for the presence of 'zlib' in the output of
        * curl_version() to determine wheter compression is supported or not
        */
        var $accepted_compression = array();
        /**
        * Name of compression scheme to be used for sending requests.
        * Either null, gzip or deflate
        */
        var $request_compression = '';
        /**
        * CURL handle: used for keep-alive connections (PHP 4.3.8 up, see:
        * http://curl.haxx.se/docs/faq.html#7.3)
        */
        var $xmlrpc_curl_handle = null;
        /// Wheter to use persistent connections for http 1.1 and https
        var $keepalive = false;
        /// Charset encodings that can be decoded without problems by the client
        var $accepted_charset_encodings = array();
        /// Charset encoding to be used in serializing request. NULL = use ASCII
        var $request_charset_encoding = '';
        /**
        * Decides the content of xmlrpcresp objects returned by calls to send()
        * valid strings are 'xmlrpcvals', 'phpvals' or 'xml'
        */
        var $return_type = 'xmlrpcvals';
        /**
        * Sent to servers in http headers
        */
        var $user_agent;

        /**
        * @param string $path either the complete server URL or the PATH part of the xmlrc server URL, e.g. /xmlrpc/server.php
        * @param string $server the server name / ip address
        * @param integer $port the port the server is listening on, defaults to 80 or 443 depending on protocol used
        * @param string $method the http protocol variant: defaults to 'http', 'https' and 'http11' can be used if CURL is installed
        */
        function xmlrpc_client($path, $server='', $port='', $method='')
        {
            // allow user to specify all params in $path
            if($server == '' and $port == '' and $method == '')
            {
                $parts = parse_url($path);
                $server = $parts['host'];
                $path = isset($parts['path']) ? $parts['path'] : '';
                if(isset($parts['query']))
                {
                    $path .= '?'.$parts['query'];
                }
                if(isset($parts['fragment']))
                {
                    $path .= '#'.$parts['fragment'];
                }
                if(isset($parts['port']))
                {
                    $port = $parts['port'];
                }
                if(isset($parts['scheme']))
                {
                    $method = $parts['scheme'];
                }
                if(isset($parts['user']))
                {
                    $this->username = $parts['user'];
                }
                if(isset($parts['pass']))
                {
                    $this->password = $parts['pass'];
                }
            }
            if($path == '' || $path[0] != '/')
            {
                $this->path='/'.$path;
            }
            else
            {
                $this->path=$path;
            }
            $this->server=$server;
            if($port != '')
            {
                $this->port=$port;
            }
            if($method != '')
            {
                $this->method=$method;
            }

            // if ZLIB is enabled, let the client by default accept compressed responses
            if(function_exists('gzinflate') || (
                function_exists('curl_init') && (($info = curl_version()) &&
                ((is_string($info) && strpos($info, 'zlib') !== null) || isset($info['libz_version'])))
            ))
            {
                $this->accepted_compression = array('gzip', 'deflate');
            }

            // keepalives: enabled by default
            $this->keepalive = true;

            // by default the xml parser can support these 3 charset encodings
            $this->accepted_charset_encodings = array('UTF-8', 'ISO-8859-1', 'US-ASCII');

            // initialize user_agent string
            $this->user_agent = $GLOBALS['xmlrpcName'] . ' ' . $GLOBALS['xmlrpcVersion'];
        }

        /**
        * Enables/disables the echoing to screen of the xmlrpc responses received
        * @param integer $debug values 0, 1 and 2 are supported (2 = echo sent msg too, before received response)
        * @access public
        */
        function setDebug($in)
        {
            $this->debug=$in;
        }

        /**
        * Add some http BASIC AUTH credentials, used by the client to authenticate
        * @param string $u username
        * @param string $p password
        * @param integer $t auth type. See curl_setopt man page for supported auth types. Defaults to CURLAUTH_BASIC (basic auth)
        * @access public
        */
        function setCredentials($u, $p, $t=1)
        {
            $this->username=$u;
            $this->password=$p;
            $this->authtype=$t;
        }

        /**
        * Add a client-side https certificate
        * @param string $cert
        * @param string $certpass
        * @access public
        */
        function setCertificate($cert, $certpass)
        {
            $this->cert = $cert;
            $this->certpass = $certpass;
        }

        /**
        * Add a CA certificate to verify server with (see man page about
        * CURLOPT_CAINFO for more details
        * @param string $cacert certificate file name (or dir holding certificates)
        * @param bool $is_dir set to true to indicate cacert is a dir. defaults to false
        * @access public
        */
        function setCaCertificate($cacert, $is_dir=false)
        {
            if ($is_dir)
            {
                $this->cacertdir = $cacert;
            }
            else
            {
                $this->cacert = $cacert;
            }
        }

        /**
        * Set attributes for SSL communication: private SSL key
        * NB: does not work in older php/curl installs
        * Thanks to Daniel Convissor
        * @param string $key The name of a file containing a private SSL key
        * @param string $keypass The secret password needed to use the private SSL key
        * @access public
        */
        function setKey($key, $keypass)
        {
            $this->key = $key;
            $this->keypass = $keypass;
        }

        /**
        * Set attributes for SSL communication: verify server certificate
        * @param bool $i enable/disable verification of peer certificate
        * @access public
        */
        function setSSLVerifyPeer($i)
        {
            $this->verifypeer = $i;
        }

        /**
        * Set attributes for SSL communication: verify match of server cert w. hostname
        * @param int $i
        * @access public
        */
        function setSSLVerifyHost($i)
        {
            $this->verifyhost = $i;
        }

        /**
        * Set proxy info
        * @param string $proxyhost
        * @param string $proxyport Defaults to 8080 for HTTP and 443 for HTTPS
        * @param string $proxyusername Leave blank if proxy has public access
        * @param string $proxypassword Leave blank if proxy has public access
        * @param int $proxyauthtype set to constant CURLAUTH_NTLM to use NTLM auth with proxy
        * @access public
        */
        function setProxy($proxyhost, $proxyport, $proxyusername = '', $proxypassword = '', $proxyauthtype = 1)
        {
            $this->proxy = $proxyhost;
            $this->proxyport = $proxyport;
            $this->proxy_user = $proxyusername;
            $this->proxy_pass = $proxypassword;
            $this->proxy_authtype = $proxyauthtype;
        }

        /**
        * Enables/disables reception of compressed xmlrpc responses.
        * Note that enabling reception of compressed responses merely adds some standard
        * http headers to xmlrpc requests. It is up to the xmlrpc server to return
        * compressed responses when receiving such requests.
        * @param string $compmethod either 'gzip', 'deflate', 'any' or ''
        * @access public
        */
        function setAcceptedCompression($compmethod)
        {
            if ($compmethod == 'any')
                $this->accepted_compression = array('gzip', 'deflate');
            else
                $this->accepted_compression = array($compmethod);
        }

        /**
        * Enables/disables http compression of xmlrpc request.
        * Take care when sending compressed requests: servers might not support them
        * (and automatic fallback to uncompressed requests is not yet implemented)
        * @param string $compmethod either 'gzip', 'deflate' or ''
        * @access public
        */
        function setRequestCompression($compmethod)
        {
            $this->request_compression = $compmethod;
        }

        /**
        * Adds a cookie to list of cookies that will be sent to server.
        * NB: setting any param but name and value will turn the cookie into a 'version 1' cookie:
        * do not do it unless you know what you are doing
        * @param string $name
        * @param string $value
        * @param string $path
        * @param string $domain
        * @param int $port
        * @access public
        *
        * @todo check correctness of urlencoding cookie value (copied from php way of doing it...)
        */
        function setCookie($name, $value='', $path='', $domain='', $port=null)
        {
            $this->cookies[$name]['value'] = urlencode($value);
            if ($path || $domain || $port)
            {
                $this->cookies[$name]['path'] = $path;
                $this->cookies[$name]['domain'] = $domain;
                $this->cookies[$name]['port'] = $port;
                $this->cookies[$name]['version'] = 1;
            }
            else
            {
                $this->cookies[$name]['version'] = 0;
            }
        }

        /**
        * Directly set cURL options, for extra flexibility
        * It allows eg. to bind client to a specific IP interface / address
        * @param $options array
        */
        function SetCurlOptions( $options )
        {
            $this->extracurlopts = $options;
        }

        /**
        * Set user-agent string that will be used by this client instance
        * in http headers sent to the server
        */
        function SetUserAgent( $agentstring )
        {
            $this->user_agent = $agentstring;
        }

        /**
        * Send an xmlrpc request
        * @param mixed $msg The message object, or an array of messages for using multicall, or the complete xml representation of a request
        * @param integer $timeout Connection timeout, in seconds, If unspecified, a platform specific timeout will apply
        * @param string $method if left unspecified, the http protocol chosen during creation of the object will be used
        * @return xmlrpcresp
        * @access public
        */
        function& send($msg, $timeout=0, $method='')
        {
            // if user deos not specify http protocol, use native method of this client
            // (i.e. method set during call to constructor)
            if($method == '')
            {
                $method = $this->method;
            }

            if(is_array($msg))
            {
                // $msg is an array of xmlrpcmsg's
                $r = $this->multicall($msg, $timeout, $method);
                return $r;
            }
            elseif(is_string($msg))
            {
                $n = new xmlrpcmsg('');
                $n->payload = $msg;
                $msg = $n;
            }

            // where msg is an xmlrpcmsg
            $msg->debug=$this->debug;

            if($method == 'https')
            {
                $r =& $this->sendPayloadHTTPS(
                    $msg,
                    $this->server,
                    $this->port,
                    $timeout,
                    $this->username,
                    $this->password,
                    $this->authtype,
                    $this->cert,
                    $this->certpass,
                    $this->cacert,
                    $this->cacertdir,
                    $this->proxy,
                    $this->proxyport,
                    $this->proxy_user,
                    $this->proxy_pass,
                    $this->proxy_authtype,
                    $this->keepalive,
                    $this->key,
                    $this->keypass
                );
            }
            elseif($method == 'http11')
            {
                $r =& $this->sendPayloadCURL(
                    $msg,
                    $this->server,
                    $this->port,
                    $timeout,
                    $this->username,
                    $this->password,
                    $this->authtype,
                    null,
                    null,
                    null,
                    null,
                    $this->proxy,
                    $this->proxyport,
                    $this->proxy_user,
                    $this->proxy_pass,
                    $this->proxy_authtype,
                    'http',
                    $this->keepalive
                );
            }
            else
            {
                $r =& $this->sendPayloadHTTP10(
                    $msg,
                    $this->server,
                    $this->port,
                    $timeout,
                    $this->username,
                    $this->password,
                    $this->authtype,
                    $this->proxy,
                    $this->proxyport,
                    $this->proxy_user,
                    $this->proxy_pass,
                    $this->proxy_authtype
                );
            }

            return $r;
        }

        /**
        * @access private
        */
        function &sendPayloadHTTP10($msg, $server, $port, $timeout=0,
            $username='', $password='', $authtype=1, $proxyhost='',
            $proxyport=0, $proxyusername='', $proxypassword='', $proxyauthtype=1)
        {
            if($port==0)
            {
                $port=80;
            }

            // Only create the payload if it was not created previously
            if(empty($msg->payload))
            {
                $msg->createPayload($this->request_charset_encoding);
            }

            $payload = $msg->payload;
            // Deflate request body and set appropriate request headers
            if(function_exists('gzdeflate') && ($this->request_compression == 'gzip' || $this->request_compression == 'deflate'))
            {
                if($this->request_compression == 'gzip')
                {
                    $a = @gzencode($payload);
                    if($a)
                    {
                        $payload = $a;
                        $encoding_hdr = "Content-Encoding: gzip\r\n";
                    }
                }
                else
                {
                    $a = @gzcompress($payload);
                    if($a)
                    {
                        $payload = $a;
                        $encoding_hdr = "Content-Encoding: deflate\r\n";
                    }
                }
            }
            else
            {
                $encoding_hdr = '';
            }

            // thanks to Grant Rauscher <grant7@firstworld.net> for this
            $credentials='';
            if($username!='')
            {
                $credentials='Authorization: Basic ' . base64_encode($username . ':' . $password) . "\r\n";
                if ($authtype != 1)
                {
                    error_log('XML-RPC: '.__METHOD__.': warning. Only Basic auth is supported with HTTP 1.0');
                }
            }

            $accepted_encoding = '';
            if(is_array($this->accepted_compression) && count($this->accepted_compression))
            {
                $accepted_encoding = 'Accept-Encoding: ' . implode(', ', $this->accepted_compression) . "\r\n";
            }

            $proxy_credentials = '';
            if($proxyhost)
            {
                if($proxyport == 0)
                {
                    $proxyport = 8080;
                }
                $connectserver = $proxyhost;
                $connectport = $proxyport;
                $uri = 'http://'.$server.':'.$port.$this->path;
                if($proxyusername != '')
                {
                    if ($proxyauthtype != 1)
                    {
                        error_log('XML-RPC: '.__METHOD__.': warning. Only Basic auth to proxy is supported with HTTP 1.0');
                    }
                    $proxy_credentials = 'Proxy-Authorization: Basic ' . base64_encode($proxyusername.':'.$proxypassword) . "\r\n";
                }
            }
            else
            {
                $connectserver = $server;
                $connectport = $port;
                $uri = $this->path;
            }

            // Cookie generation, as per rfc2965 (version 1 cookies) or
            // netscape's rules (version 0 cookies)
            $cookieheader='';
            if (count($this->cookies))
            {
                $version = '';
                foreach ($this->cookies as $name => $cookie)
                {
                    if ($cookie['version'])
                    {
                        $version = ' $Version="' . $cookie['version'] . '";';
                        $cookieheader .= ' ' . $name . '="' . $cookie['value'] . '";';
                        if ($cookie['path'])
                            $cookieheader .= ' $Path="' . $cookie['path'] . '";';
                        if ($cookie['domain'])
                            $cookieheader .= ' $Domain="' . $cookie['domain'] . '";';
                        if ($cookie['port'])
                            $cookieheader .= ' $Port="' . $cookie['port'] . '";';
                    }
                    else
                    {
                        $cookieheader .= ' ' . $name . '=' . $cookie['value'] . ";";
                    }
                }
                $cookieheader = 'Cookie:' . $version . substr($cookieheader, 0, -1) . "\r\n";
            }

            $op= 'POST ' . $uri. " HTTP/1.0\r\n" .
                'User-Agent: ' . $this->user_agent . "\r\n" .
                'Host: '. $server . ':' . $port . "\r\n" .
                $credentials .
                $proxy_credentials .
                $accepted_encoding .
                $encoding_hdr .
                'Accept-Charset: ' . implode(',', $this->accepted_charset_encodings) . "\r\n" .
                $cookieheader .
                'Content-Type: ' . $msg->content_type . "\r\nContent-Length: " .
                strlen($payload) . "\r\n\r\n" .
                $payload;

            if($this->debug > 1)
            {
                print "<PRE>\n---SENDING---\n" . htmlentities($op) . "\n---END---\n</PRE>";
                // let the client see this now in case http times out...
                flush();
            }

            if($timeout>0)
            {
                $fp=@fsockopen($connectserver, $connectport, $this->errno, $this->errstr, $timeout);
            }
            else
            {
                $fp=@fsockopen($connectserver, $connectport, $this->errno, $this->errstr);
            }
            if($fp)
            {
                if($timeout>0 && function_exists('stream_set_timeout'))
                {
                    stream_set_timeout($fp, $timeout);
                }
            }
            else
            {
                $this->errstr='Connect error: '.$this->errstr;
                $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['http_error'], $this->errstr . ' (' . $this->errno . ')');
                return $r;
            }

            if(!fputs($fp, $op, strlen($op)))
            {
                fclose($fp);
                $this->errstr='Write error';
                $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['http_error'], $this->errstr);
                return $r;
            }
            else
            {
                // reset errno and errstr on succesful socket connection
                $this->errstr = '';
            }
            // G. Giunta 2005/10/24: close socket before parsing.
            // should yeld slightly better execution times, and make easier recursive calls (e.g. to follow http redirects)
            $ipd='';
            do
            {
                // shall we check for $data === FALSE?
                // as per the manual, it signals an error
                $ipd.=fread($fp, 32768);
            } while(!feof($fp));
            fclose($fp);
            $r =& $msg->parseResponse($ipd, false, $this->return_type);
            return $r;

        }

        /**
        * @access private
        */
        function &sendPayloadHTTPS($msg, $server, $port, $timeout=0, $username='',
            $password='', $authtype=1, $cert='',$certpass='', $cacert='', $cacertdir='',
            $proxyhost='', $proxyport=0, $proxyusername='', $proxypassword='', $proxyauthtype=1,
            $keepalive=false, $key='', $keypass='')
        {
            $r =& $this->sendPayloadCURL($msg, $server, $port, $timeout, $username,
                $password, $authtype, $cert, $certpass, $cacert, $cacertdir, $proxyhost, $proxyport,
                $proxyusername, $proxypassword, $proxyauthtype, 'https', $keepalive, $key, $keypass);
            return $r;
        }

        /**
        * Contributed by Justin Miller <justin@voxel.net>
        * Requires curl to be built into PHP
        * NB: CURL versions before 7.11.10 cannot use proxy to talk to https servers!
        * @access private
        */
        function &sendPayloadCURL($msg, $server, $port, $timeout=0, $username='',
            $password='', $authtype=1, $cert='', $certpass='', $cacert='', $cacertdir='',
            $proxyhost='', $proxyport=0, $proxyusername='', $proxypassword='', $proxyauthtype=1, $method='https',
            $keepalive=false, $key='', $keypass='')
        {
            if(!function_exists('curl_init'))
            {
                $this->errstr='CURL unavailable on this install';
                $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['no_curl'], $GLOBALS['xmlrpcstr']['no_curl']);
                return $r;
            }
            if($method == 'https')
            {
                if(($info = curl_version()) &&
                    ((is_string($info) && strpos($info, 'OpenSSL') === null) || (is_array($info) && !isset($info['ssl_version']))))
                {
                    $this->errstr='SSL unavailable on this install';
                    $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['no_ssl'], $GLOBALS['xmlrpcstr']['no_ssl']);
                    return $r;
                }
            }

            if($port == 0)
            {
                if($method == 'http')
                {
                    $port = 80;
                }
                else
                {
                    $port = 443;
                }
            }

            // Only create the payload if it was not created previously
            if(empty($msg->payload))
            {
                $msg->createPayload($this->request_charset_encoding);
            }

            // Deflate request body and set appropriate request headers
            $payload = $msg->payload;
            if(function_exists('gzdeflate') && ($this->request_compression == 'gzip' || $this->request_compression == 'deflate'))
            {
                if($this->request_compression == 'gzip')
                {
                    $a = @gzencode($payload);
                    if($a)
                    {
                        $payload = $a;
                        $encoding_hdr = 'Content-Encoding: gzip';
                    }
                }
                else
                {
                    $a = @gzcompress($payload);
                    if($a)
                    {
                        $payload = $a;
                        $encoding_hdr = 'Content-Encoding: deflate';
                    }
                }
            }
            else
            {
                $encoding_hdr = '';
            }

            if($this->debug > 1)
            {
                print "<PRE>\n---SENDING---\n" . htmlentities($payload) . "\n---END---\n</PRE>";
                // let the client see this now in case http times out...
                flush();
            }

            if(!$keepalive || !$this->xmlrpc_curl_handle)
            {
                $curl = curl_init($method . '://' . $server . ':' . $port . $this->path);
                if($keepalive)
                {
                    $this->xmlrpc_curl_handle = $curl;
                }
            }
            else
            {
                $curl = $this->xmlrpc_curl_handle;
            }

            // results into variable
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

            if($this->debug)
            {
                curl_setopt($curl, CURLOPT_VERBOSE, 1);
            }
            curl_setopt($curl, CURLOPT_USERAGENT, $this->user_agent);
            // required for XMLRPC: post the data
            curl_setopt($curl, CURLOPT_POST, 1);
            // the data
            curl_setopt($curl, CURLOPT_POSTFIELDS, $payload);

            // return the header too
            curl_setopt($curl, CURLOPT_HEADER, 1);

            // will only work with PHP >= 5.0
            // NB: if we set an empty string, CURL will add http header indicating
            // ALL methods it is supporting. This is possibly a better option than
            // letting the user tell what curl can / cannot do...
            if(is_array($this->accepted_compression) && count($this->accepted_compression))
            {
                //curl_setopt($curl, CURLOPT_ENCODING, implode(',', $this->accepted_compression));
                // empty string means 'any supported by CURL' (shall we catch errors in case CURLOPT_SSLKEY undefined ?)
                if (count($this->accepted_compression) == 1)
                {
                    curl_setopt($curl, CURLOPT_ENCODING, $this->accepted_compression[0]);
                }
                else
                    curl_setopt($curl, CURLOPT_ENCODING, '');
            }
            // extra headers
            $headers = array('Content-Type: ' . $msg->content_type , 'Accept-Charset: ' . implode(',', $this->accepted_charset_encodings));
            // if no keepalive is wanted, let the server know it in advance
            if(!$keepalive)
            {
                $headers[] = 'Connection: close';
            }
            // request compression header
            if($encoding_hdr)
            {
                $headers[] = $encoding_hdr;
            }

            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
            // timeout is borked
            if($timeout)
            {
                curl_setopt($curl, CURLOPT_TIMEOUT, $timeout == 1 ? 1 : $timeout - 1);
            }

            if($username && $password)
            {
                curl_setopt($curl, CURLOPT_USERPWD, $username.':'.$password);
                if (defined('CURLOPT_HTTPAUTH'))
                {
                    curl_setopt($curl, CURLOPT_HTTPAUTH, $authtype);
                }
                else if ($authtype != 1)
                {
                    error_log('XML-RPC: '.__METHOD__.': warning. Only Basic auth is supported by the current PHP/curl install');
                }
            }

            if($method == 'https')
            {
                // set cert file
                if($cert)
                {
                    curl_setopt($curl, CURLOPT_SSLCERT, $cert);
                }
                // set cert password
                if($certpass)
                {
                    curl_setopt($curl, CURLOPT_SSLCERTPASSWD, $certpass);
                }
                // whether to verify remote host's cert
                curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, $this->verifypeer);
                // set ca certificates file/dir
                if($cacert)
                {
                    curl_setopt($curl, CURLOPT_CAINFO, $cacert);
                }
                if($cacertdir)
                {
                    curl_setopt($curl, CURLOPT_CAPATH, $cacertdir);
                }
                // set key file (shall we catch errors in case CURLOPT_SSLKEY undefined ?)
                if($key)
                {
                    curl_setopt($curl, CURLOPT_SSLKEY, $key);
                }
                // set key password (shall we catch errors in case CURLOPT_SSLKEY undefined ?)
                if($keypass)
                {
                    curl_setopt($curl, CURLOPT_SSLKEYPASSWD, $keypass);
                }
                // whether to verify cert's common name (CN); 0 for no, 1 to verify that it exists, and 2 to verify that it matches the hostname used
                curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, $this->verifyhost);
            }

            // proxy info
            if($proxyhost)
            {
                if($proxyport == 0)
                {
                    $proxyport = 8080; // NB: even for HTTPS, local connection is on port 8080
                }
                curl_setopt($curl, CURLOPT_PROXY, $proxyhost.':'.$proxyport);
                //curl_setopt($curl, CURLOPT_PROXYPORT,$proxyport);
                if($proxyusername)
                {
                    curl_setopt($curl, CURLOPT_PROXYUSERPWD, $proxyusername.':'.$proxypassword);
                    if (defined('CURLOPT_PROXYAUTH'))
                    {
                        curl_setopt($curl, CURLOPT_PROXYAUTH, $proxyauthtype);
                    }
                    else if ($proxyauthtype != 1)
                    {
                        error_log('XML-RPC: '.__METHOD__.': warning. Only Basic auth to proxy is supported by the current PHP/curl install');
                    }
                }
            }

            // NB: should we build cookie http headers by hand rather than let CURL do it?
            // the following code does not honour 'expires', 'path' and 'domain' cookie attributes
            // set to client obj the the user...
            if (count($this->cookies))
            {
                $cookieheader = '';
                foreach ($this->cookies as $name => $cookie)
                {
                    $cookieheader .= $name . '=' . $cookie['value'] . '; ';
                }
                curl_setopt($curl, CURLOPT_COOKIE, substr($cookieheader, 0, -2));
            }

            foreach ($this->extracurlopts as $opt => $val)
            {
                curl_setopt($curl, $opt, $val);
            }

            $result = curl_exec($curl);

            if ($this->debug > 1)
            {
                print "<PRE>\n---CURL INFO---\n";
                foreach(curl_getinfo($curl) as $name => $val)
                     print $name . ': ' . htmlentities($val). "\n";
                print "---END---\n</PRE>";
            }

            if(!$result) /// @todo we should use a better check here - what if we get back '' or '0'?
            {
                $this->errstr='no response';
                $resp=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['curl_fail'], $GLOBALS['xmlrpcstr']['curl_fail']. ': '. curl_error($curl));
                curl_close($curl);
                if($keepalive)
                {
                    $this->xmlrpc_curl_handle = null;
                }
            }
            else
            {
                if(!$keepalive)
                {
                    curl_close($curl);
                }
                $resp =& $msg->parseResponse($result, true, $this->return_type);
            }
            return $resp;
        }

        /**
        * Send an array of request messages and return an array of responses.
        * Unless $this->no_multicall has been set to true, it will try first
        * to use one single xmlrpc call to server method system.multicall, and
        * revert to sending many successive calls in case of failure.
        * This failure is also stored in $this->no_multicall for subsequent calls.
        * Unfortunately, there is no server error code universally used to denote
        * the fact that multicall is unsupported, so there is no way to reliably
        * distinguish between that and a temporary failure.
        * If you are sure that server supports multicall and do not want to
        * fallback to using many single calls, set the fourth parameter to FALSE.
        *
        * NB: trying to shoehorn extra functionality into existing syntax has resulted
        * in pretty much convoluted code...
        *
        * @param array $msgs an array of xmlrpcmsg objects
        * @param integer $timeout connection timeout (in seconds)
        * @param string $method the http protocol variant to be used
        * @param boolean fallback When true, upon receiveing an error during multicall, multiple single calls will be attempted
        * @return array
        * @access public
        */
        function multicall($msgs, $timeout=0, $method='', $fallback=true)
        {
            if ($method == '')
            {
                $method = $this->method;
            }
            if(!$this->no_multicall)
            {
                $results = $this->_try_multicall($msgs, $timeout, $method);
                if(is_array($results))
                {
                    // System.multicall succeeded
                    return $results;
                }
                else
                {
                    // either system.multicall is unsupported by server,
                    // or call failed for some other reason.
                    if ($fallback)
                    {
                        // Don't try it next time...
                        $this->no_multicall = true;
                    }
                    else
                    {
                        if (is_a($results, 'xmlrpcresp'))
                        {
                            $result = $results;
                        }
                        else
                        {
                            $result = new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['multicall_error'], $GLOBALS['xmlrpcstr']['multicall_error']);
                        }
                    }
                }
            }
            else
            {
                // override fallback, in case careless user tries to do two
                // opposite things at the same time
                $fallback = true;
            }

            $results = array();
            if ($fallback)
            {
                // system.multicall is (probably) unsupported by server:
                // emulate multicall via multiple requests
                foreach($msgs as $msg)
                {
                    $results[] =& $this->send($msg, $timeout, $method);
                }
            }
            else
            {
                // user does NOT want to fallback on many single calls:
                // since we should always return an array of responses,
                // return an array with the same error repeated n times
                foreach($msgs as $msg)
                {
                    $results[] = $result;
                }
            }
            return $results;
        }

        /**
        * Attempt to boxcar $msgs via system.multicall.
        * Returns either an array of xmlrpcreponses, an xmlrpc error response
        * or false (when received response does not respect valid multicall syntax)
        * @access private
        */
        function _try_multicall($msgs, $timeout, $method)
        {
            // Construct multicall message
            $calls = array();
            foreach($msgs as $msg)
            {
                $call['methodName'] = new xmlrpcval($msg->method(),'string');
                $numParams = $msg->getNumParams();
                $params = array();
                for($i = 0; $i < $numParams; $i++)
                {
                    $params[$i] = $msg->getParam($i);
                }
                $call['params'] = new xmlrpcval($params, 'array');
                $calls[] = new xmlrpcval($call, 'struct');
            }
            $multicall = new xmlrpcmsg('system.multicall');
            $multicall->addParam(new xmlrpcval($calls, 'array'));

            // Attempt RPC call
            $result =& $this->send($multicall, $timeout, $method);

            if($result->faultCode() != 0)
            {
                // call to system.multicall failed
                return $result;
            }

            // Unpack responses.
            $rets = $result->value();

            if ($this->return_type == 'xml')
            {
                    return $rets;
            }
            else if ($this->return_type == 'phpvals')
            {
                ///@todo test this code branch...
                $rets = $result->value();
                if(!is_array($rets))
                {
                    return false;       // bad return type from system.multicall
                }
                $numRets = count($rets);
                if($numRets != count($msgs))
                {
                    return false;       // wrong number of return values.
                }

                $response = array();
                for($i = 0; $i < $numRets; $i++)
                {
                    $val = $rets[$i];
                    if (!is_array($val)) {
                        return false;
                    }
                    switch(count($val))
                    {
                        case 1:
                            if(!isset($val[0]))
                            {
                                return false;       // Bad value
                            }
                            // Normal return value
                            $response[$i] = new xmlrpcresp($val[0], 0, '', 'phpvals');
                            break;
                        case 2:
                            /// @todo remove usage of @: it is apparently quite slow
                            $code = @$val['faultCode'];
                            if(!is_int($code))
                            {
                                return false;
                            }
                            $str = @$val['faultString'];
                            if(!is_string($str))
                            {
                                return false;
                            }
                            $response[$i] = new xmlrpcresp(0, $code, $str);
                            break;
                        default:
                            return false;
                    }
                }
                return $response;
            }
            else // return type == 'xmlrpcvals'
            {
                $rets = $result->value();
                if($rets->kindOf() != 'array')
                {
                    return false;       // bad return type from system.multicall
                }
                $numRets = $rets->arraysize();
                if($numRets != count($msgs))
                {
                    return false;       // wrong number of return values.
                }

                $response = array();
                for($i = 0; $i < $numRets; $i++)
                {
                    $val = $rets->arraymem($i);
                    switch($val->kindOf())
                    {
                        case 'array':
                            if($val->arraysize() != 1)
                            {
                                return false;       // Bad value
                            }
                            // Normal return value
                            $response[$i] = new xmlrpcresp($val->arraymem(0));
                            break;
                        case 'struct':
                            $code = $val->structmem('faultCode');
                            if($code->kindOf() != 'scalar' || $code->scalartyp() != 'int')
                            {
                                return false;
                            }
                            $str = $val->structmem('faultString');
                            if($str->kindOf() != 'scalar' || $str->scalartyp() != 'string')
                            {
                                return false;
                            }
                            $response[$i] = new xmlrpcresp(0, $code->scalarval(), $str->scalarval());
                            break;
                        default:
                            return false;
                    }
                }
                return $response;
            }
        }
    } // end class xmlrpc_client

    class xmlrpcresp
    {
        var $val = 0;
        var $valtyp;
        var $errno = 0;
        var $errstr = '';
        var $payload;
        var $hdrs = array();
        var $_cookies = array();
        var $content_type = 'text/xml';
        var $raw_data = '';

        /**
        * @param mixed $val either an xmlrpcval obj, a php value or the xml serialization of an xmlrpcval (a string)
        * @param integer $fcode set it to anything but 0 to create an error response
        * @param string $fstr the error string, in case of an error response
        * @param string $valtyp either 'xmlrpcvals', 'phpvals' or 'xml'
        *
        * @todo add check that $val / $fcode / $fstr is of correct type???
        * NB: as of now we do not do it, since it might be either an xmlrpcval or a plain
        * php val, or a complete xml chunk, depending on usage of xmlrpc_client::send() inside which creator is called...
        */
        function xmlrpcresp($val, $fcode = 0, $fstr = '', $valtyp='')
        {
            if($fcode != 0)
            {
                // error response
                $this->errno = $fcode;
                $this->errstr = $fstr;
                //$this->errstr = htmlspecialchars($fstr); // XXX: encoding probably shouldn't be done here; fix later.
            }
            else
            {
                // successful response
                $this->val = $val;
                if ($valtyp == '')
                {
                    // user did not declare type of response value: try to guess it
                    if (is_object($this->val) && is_a($this->val, 'xmlrpcval'))
                    {
                        $this->valtyp = 'xmlrpcvals';
                    }
                    else if (is_string($this->val))
                    {
                        $this->valtyp = 'xml';

                    }
                    else
                    {
                        $this->valtyp = 'phpvals';
                    }
                }
                else
                {
                    // user declares type of resp value: believe him
                    $this->valtyp = $valtyp;
                }
            }
        }

        /**
        * Returns the error code of the response.
        * @return integer the error code of this response (0 for not-error responses)
        * @access public
        */
        function faultCode()
        {
            return $this->errno;
        }

        /**
        * Returns the error code of the response.
        * @return string the error string of this response ('' for not-error responses)
        * @access public
        */
        function faultString()
        {
            return $this->errstr;
        }

        /**
        * Returns the value received by the server.
        * @return mixed the xmlrpcval object returned by the server. Might be an xml string or php value if the response has been created by specially configured xmlrpc_client objects
        * @access public
        */
        function value()
        {
            return $this->val;
        }

        /**
        * Returns an array with the cookies received from the server.
        * Array has the form: $cookiename => array ('value' => $val, $attr1 => $val1, $attr2 = $val2, ...)
        * with attributes being e.g. 'expires', 'path', domain'.
        * NB: cookies sent as 'expired' by the server (i.e. with an expiry date in the past)
        * are still present in the array. It is up to the user-defined code to decide
        * how to use the received cookies, and wheter they have to be sent back with the next
        * request to the server (using xmlrpc_client::setCookie) or not
        * @return array array of cookies received from the server
        * @access public
        */
        function cookies()
        {
            return $this->_cookies;
        }

        /**
        * Returns xml representation of the response. XML prologue not included
        * @param string $charset_encoding the charset to be used for serialization. if null, US-ASCII is assumed
        * @return string the xml representation of the response
        * @access public
        */
        function serialize($charset_encoding='')
        {
            if ($charset_encoding != '')
                $this->content_type = 'text/xml; charset=' . $charset_encoding;
            else
                $this->content_type = 'text/xml';
            $result = "<methodResponse>\n";
            if($this->errno)
            {
                // G. Giunta 2005/2/13: let non-ASCII response messages be tolerated by clients
                // by xml-encoding non ascii chars
                $result .= "<fault>\n" .
"<value>\n<struct><member><name>faultCode</name>\n<value><int>" . $this->errno .
"</int></value>\n</member>\n<member>\n<name>faultString</name>\n<value><string>" .
xmlrpc_encode_entitites($this->errstr, $GLOBALS['xmlrpc_internalencoding'], $charset_encoding) . "</string></value>\n</member>\n" .
"</struct>\n</value>\n</fault>";
            }
            else
            {
                if(!is_object($this->val) || !is_a($this->val, 'xmlrpcval'))
                {
                    if (is_string($this->val) && $this->valtyp == 'xml')
                    {
                        $result .= "<params>\n<param>\n" .
                            $this->val .
                            "</param>\n</params>";
                    }
                    else
                    {
                        /// @todo try to build something serializable?
                        die('cannot serialize xmlrpcresp objects whose content is native php values');
                    }
                }
                else
                {
                    $result .= "<params>\n<param>\n" .
                        $this->val->serialize($charset_encoding) .
                        "</param>\n</params>";
                }
            }
            $result .= "\n</methodResponse>";
            $this->payload = $result;
            return $result;
        }
    }

    class xmlrpcmsg
    {
        var $payload;
        var $methodname;
        var $params=array();
        var $debug=0;
        var $content_type = 'text/xml';

        /**
        * @param string $meth the name of the method to invoke
        * @param array $pars array of parameters to be paased to the method (xmlrpcval objects)
        */
        function xmlrpcmsg($meth, $pars=0)
        {
            $this->methodname=$meth;
            if(is_array($pars) && count($pars)>0)
            {
                for($i=0; $i<count($pars); $i++)
                {
                    $this->addParam($pars[$i]);
                }
            }
        }

        /**
        * @access private
        */
        function xml_header($charset_encoding='')
        {
            if ($charset_encoding != '')
            {
                return "<?xml version=\"1.0\" encoding=\"$charset_encoding\" ?" . ">\n<methodCall>\n";
            }
            else
            {
                return "<?xml version=\"1.0\"?" . ">\n<methodCall>\n";
            }
        }

        /**
        * @access private
        */
        function xml_footer()
        {
            return '</methodCall>';
        }

        /**
        * @access private
        */
        function kindOf()
        {
            return 'msg';
        }

        /**
        * @access private
        */
        function createPayload($charset_encoding='')
        {
            if ($charset_encoding != '')
                $this->content_type = 'text/xml; charset=' . $charset_encoding;
            else
                $this->content_type = 'text/xml';
            $this->payload=$this->xml_header($charset_encoding);
            $this->payload.='<methodName>' . $this->methodname . "</methodName>\n";
            $this->payload.="<params>\n";
            for($i=0; $i<count($this->params); $i++)
            {
                $p=$this->params[$i];
                $this->payload.="<param>\n" . $p->serialize($charset_encoding) .
                "</param>\n";
            }
            $this->payload.="</params>\n";
            $this->payload.=$this->xml_footer();
        }

        /**
        * Gets/sets the xmlrpc method to be invoked
        * @param string $meth the method to be set (leave empty not to set it)
        * @return string the method that will be invoked
        * @access public
        */
        function method($meth='')
        {
            if($meth!='')
            {
                $this->methodname=$meth;
            }
            return $this->methodname;
        }

        /**
        * Returns xml representation of the message. XML prologue included
        * @return string the xml representation of the message, xml prologue included
        * @access public
        */
        function serialize($charset_encoding='')
        {
            $this->createPayload($charset_encoding);
            return $this->payload;
        }

        /**
        * Add a parameter to the list of parameters to be used upon method invocation
        * @param xmlrpcval $par
        * @return boolean false on failure
        * @access public
        */
        function addParam($par)
        {
            // add check: do not add to self params which are not xmlrpcvals
            if(is_object($par) && is_a($par, 'xmlrpcval'))
            {
                $this->params[]=$par;
                return true;
            }
            else
            {
                return false;
            }
        }

        /**
        * Returns the nth parameter in the message. The index zero-based.
        * @param integer $i the index of the parameter to fetch (zero based)
        * @return xmlrpcval the i-th parameter
        * @access public
        */
        function getParam($i) { return $this->params[$i]; }

        /**
        * Returns the number of parameters in the messge.
        * @return integer the number of parameters currently set
        * @access public
        */
        function getNumParams() { return count($this->params); }

        /**
        * Given an open file handle, read all data available and parse it as axmlrpc response.
        * NB: the file handle is not closed by this function.
        * NNB: might have trouble in rare cases to work on network streams, as we
        *      check for a read of 0 bytes instead of feof($fp).
        *      But since checking for feof(null) returns false, we would risk an
        *      infinite loop in that case, because we cannot trust the caller
        *      to give us a valid pointer to an open file...
        * @access public
        * @return xmlrpcresp
        * @todo add 2nd & 3rd param to be passed to ParseResponse() ???
        */
        function &parseResponseFile($fp)
        {
            $ipd='';
            while($data=fread($fp, 32768))
            {
                $ipd.=$data;
            }
            //fclose($fp);
            $r =& $this->parseResponse($ipd);
            return $r;
        }

        /**
        * Parses HTTP headers and separates them from data.
        * @access private
        */
        function &parseResponseHeaders(&$data, $headers_processed=false)
        {
                // Support "web-proxy-tunelling" connections for https through proxies
                if(preg_match('/^HTTP\/1\.[0-1] 200 Connection established/', $data))
                {
                    // Look for CR/LF or simple LF as line separator,
                    // (even though it is not valid http)
                    $pos = strpos($data,"\r\n\r\n");
                    if($pos || is_int($pos))
                    {
                        $bd = $pos+4;
                    }
                    else
                    {
                        $pos = strpos($data,"\n\n");
                        if($pos || is_int($pos))
                        {
                            $bd = $pos+2;
                        }
                        else
                        {
                            // No separation between response headers and body: fault?
                            $bd = 0;
                        }
                    }
                    if ($bd)
                    {
                        // this filters out all http headers from proxy.
                        // maybe we could take them into account, too?
                        $data = substr($data, $bd);
                    }
                    else
                    {
                        error_log('XML-RPC: '.__METHOD__.': HTTPS via proxy error, tunnel connection possibly failed');
                        $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['http_error'], $GLOBALS['xmlrpcstr']['http_error']. ' (HTTPS via proxy error, tunnel connection possibly failed)');
                        return $r;
                    }
                }

                // Strip HTTP 1.1 100 Continue header if present
                while(preg_match('/^HTTP\/1\.1 1[0-9]{2} /', $data))
                {
                    $pos = strpos($data, 'HTTP', 12);
                    // server sent a Continue header without any (valid) content following...
                    // give the client a chance to know it
                    if(!$pos && !is_int($pos)) // works fine in php 3, 4 and 5
                    {
                        break;
                    }
                    $data = substr($data, $pos);
                }
                if(!preg_match('/^HTTP\/[0-9.]+ 200 /', $data))
                {
                    $errstr= substr($data, 0, strpos($data, "\n")-1);
                    error_log('XML-RPC: '.__METHOD__.': HTTP error, got response: ' .$errstr);
                    $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['http_error'], $GLOBALS['xmlrpcstr']['http_error']. ' (' . $errstr . ')');
                    return $r;
                }

                $GLOBALS['_xh']['headers'] = array();
                $GLOBALS['_xh']['cookies'] = array();

                // be tolerant to usage of \n instead of \r\n to separate headers and data
                // (even though it is not valid http)
                $pos = strpos($data,"\r\n\r\n");
                if($pos || is_int($pos))
                {
                    $bd = $pos+4;
                }
                else
                {
                    $pos = strpos($data,"\n\n");
                    if($pos || is_int($pos))
                    {
                        $bd = $pos+2;
                    }
                    else
                    {
                        // No separation between response headers and body: fault?
                        // we could take some action here instead of going on...
                        $bd = 0;
                    }
                }
                // be tolerant to line endings, and extra empty lines
                $ar = preg_split("/\r?\n/", trim(substr($data, 0, $pos)));
                while(list(,$line) = @each($ar))
                {
                    // take care of multi-line headers and cookies
                    $arr = explode(':',$line,2);
                    if(count($arr) > 1)
                    {
                        $header_name = strtolower(trim($arr[0]));
                        /// @todo some other headers (the ones that allow a CSV list of values)
                        /// do allow many values to be passed using multiple header lines.
                        /// We should add content to $GLOBALS['_xh']['headers'][$header_name]
                        /// instead of replacing it for those...
                        if ($header_name == 'set-cookie' || $header_name == 'set-cookie2')
                        {
                            if ($header_name == 'set-cookie2')
                            {
                                // version 2 cookies:
                                // there could be many cookies on one line, comma separated
                                $cookies = explode(',', $arr[1]);
                            }
                            else
                            {
                                $cookies = array($arr[1]);
                            }
                            foreach ($cookies as $cookie)
                            {
                                // glue together all received cookies, using a comma to separate them
                                // (same as php does with getallheaders())
                                if (isset($GLOBALS['_xh']['headers'][$header_name]))
                                    $GLOBALS['_xh']['headers'][$header_name] .= ', ' . trim($cookie);
                                else
                                    $GLOBALS['_xh']['headers'][$header_name] = trim($cookie);
                                // parse cookie attributes, in case user wants to correctly honour them
                                // feature creep: only allow rfc-compliant cookie attributes?
                                // @todo support for server sending multiple time cookie with same name, but using different PATHs
                                $cookie = explode(';', $cookie);
                                foreach ($cookie as $pos => $val)
                                {
                                    $val = explode('=', $val, 2);
                                    $tag = trim($val[0]);
                                    $val = trim(@$val[1]);
                                    /// @todo with version 1 cookies, we should strip leading and trailing " chars
                                    if ($pos == 0)
                                    {
                                        $cookiename = $tag;
                                        $GLOBALS['_xh']['cookies'][$tag] = array();
                                        $GLOBALS['_xh']['cookies'][$cookiename]['value'] = urldecode($val);
                                    }
                                    else
                                    {
                                        if ($tag != 'value')
                                        {
                                          $GLOBALS['_xh']['cookies'][$cookiename][$tag] = $val;
                                        }
                                    }
                                }
                            }
                        }
                        else
                        {
                            $GLOBALS['_xh']['headers'][$header_name] = trim($arr[1]);
                        }
                    }
                    elseif(isset($header_name))
                    {
                        /// @todo version1 cookies might span multiple lines, thus breaking the parsing above
                        $GLOBALS['_xh']['headers'][$header_name] .= ' ' . trim($line);
                    }
                }

                $data = substr($data, $bd);

                if($this->debug && count($GLOBALS['_xh']['headers']))
                {
                    print '<PRE>';
                    foreach($GLOBALS['_xh']['headers'] as $header => $value)
                    {
                        print htmlentities("HEADER: $header: $value\n");
                    }
                    foreach($GLOBALS['_xh']['cookies'] as $header => $value)
                    {
                        print htmlentities("COOKIE: $header={$value['value']}\n");
                    }
                    print "</PRE>\n";
                }

                // if CURL was used for the call, http headers have been processed,
                // and dechunking + reinflating have been carried out
                if(!$headers_processed)
                {
                    // Decode chunked encoding sent by http 1.1 servers
                    if(isset($GLOBALS['_xh']['headers']['transfer-encoding']) && $GLOBALS['_xh']['headers']['transfer-encoding'] == 'chunked')
                    {
                        if(!$data = decode_chunked($data))
                        {
                            error_log('XML-RPC: '.__METHOD__.': errors occurred when trying to rebuild the chunked data received from server');
                            $r = new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['dechunk_fail'], $GLOBALS['xmlrpcstr']['dechunk_fail']);
                            return $r;
                        }
                    }

                    // Decode gzip-compressed stuff
                    // code shamelessly inspired from nusoap library by Dietrich Ayala
                    if(isset($GLOBALS['_xh']['headers']['content-encoding']))
                    {
                        $GLOBALS['_xh']['headers']['content-encoding'] = str_replace('x-', '', $GLOBALS['_xh']['headers']['content-encoding']);
                        if($GLOBALS['_xh']['headers']['content-encoding'] == 'deflate' || $GLOBALS['_xh']['headers']['content-encoding'] == 'gzip')
                        {
                            // if decoding works, use it. else assume data wasn't gzencoded
                            if(function_exists('gzinflate'))
                            {
                                if($GLOBALS['_xh']['headers']['content-encoding'] == 'deflate' && $degzdata = @gzuncompress($data))
                                {
                                    $data = $degzdata;
                                    if($this->debug)
                                    print "<PRE>---INFLATED RESPONSE---[".strlen($data)." chars]---\n" . htmlentities($data) . "\n---END---</PRE>";
                                }
                                elseif($GLOBALS['_xh']['headers']['content-encoding'] == 'gzip' && $degzdata = @gzinflate(substr($data, 10)))
                                {
                                    $data = $degzdata;
                                    if($this->debug)
                                    print "<PRE>---INFLATED RESPONSE---[".strlen($data)." chars]---\n" . htmlentities($data) . "\n---END---</PRE>";
                                }
                                else
                                {
                                    error_log('XML-RPC: '.__METHOD__.': errors occurred when trying to decode the deflated data received from server');
                                    $r = new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['decompress_fail'], $GLOBALS['xmlrpcstr']['decompress_fail']);
                                    return $r;
                                }
                            }
                            else
                            {
                                error_log('XML-RPC: '.__METHOD__.': the server sent deflated data. Your php install must have the Zlib extension compiled in to support this.');
                                $r = new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['cannot_decompress'], $GLOBALS['xmlrpcstr']['cannot_decompress']);
                                return $r;
                            }
                        }
                    }
                } // end of 'if needed, de-chunk, re-inflate response'

                // real stupid hack to avoid PHP complaining about returning NULL by ref
                $r = null;
                $r =& $r;
                return $r;
        }

        /**
        * Parse the xmlrpc response contained in the string $data and return an xmlrpcresp object.
        * @param string $data the xmlrpc response, eventually including http headers
        * @param bool $headers_processed when true prevents parsing HTTP headers for interpretation of content-encoding and consequent decoding
        * @param string $return_type decides return type, i.e. content of response->value(). Either 'xmlrpcvals', 'xml' or 'phpvals'
        * @return xmlrpcresp
        * @access public
        */
        function &parseResponse($data='', $headers_processed=false, $return_type='xmlrpcvals')
        {
            if($this->debug)
            {
                //by maHo, replaced htmlspecialchars with htmlentities
                print "<PRE>---GOT---\n" . htmlentities($data) . "\n---END---\n</PRE>";
            }

            if($data == '')
            {
                error_log('XML-RPC: '.__METHOD__.': no response received from server.');
                $r = new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['no_data'], $GLOBALS['xmlrpcstr']['no_data']);
                return $r;
            }

            $GLOBALS['_xh']=array();

            $raw_data = $data;
            // parse the HTTP headers of the response, if present, and separate them from data
            if(substr($data, 0, 4) == 'HTTP')
            {
                $r =& $this->parseResponseHeaders($data, $headers_processed);
                if ($r)
                {
                    // failed processing of HTTP response headers
                    // save into response obj the full payload received, for debugging
                    $r->raw_data = $data;
                    return $r;
                }
            }
            else
            {
                $GLOBALS['_xh']['headers'] = array();
                $GLOBALS['_xh']['cookies'] = array();
            }

            if($this->debug)
            {
                $start = strpos($data, '<!-- SERVER DEBUG INFO (BASE64 ENCODED):');
                if ($start)
                {
                    $start += strlen('<!-- SERVER DEBUG INFO (BASE64 ENCODED):');
                    $end = strpos($data, '-->', $start);
                    $comments = substr($data, $start, $end-$start);
                    print "<PRE>---SERVER DEBUG INFO (DECODED) ---\n\t".htmlentities(str_replace("\n", "\n\t", base64_decode($comments)))."\n---END---\n</PRE>";
                }
            }

            // be tolerant of extra whitespace in response body
            $data = trim($data);

            /// @todo return an error msg if $data=='' ?

            // be tolerant of junk after methodResponse (e.g. javascript ads automatically inserted by free hosts)
            // idea from Luca Mariano <luca.mariano@email.it> originally in PEARified version of the lib
            $pos = strrpos($data, '</methodResponse>');
            if($pos !== false)
            {
                $data = substr($data, 0, $pos+17);
            }

            // if user wants back raw xml, give it to him
            if ($return_type == 'xml')
            {
                $r = new xmlrpcresp($data, 0, '', 'xml');
                $r->hdrs = $GLOBALS['_xh']['headers'];
                $r->_cookies = $GLOBALS['_xh']['cookies'];
                $r->raw_data = $raw_data;
                return $r;
            }

            // try to 'guestimate' the character encoding of the received response
            $resp_encoding = guess_encoding(@$GLOBALS['_xh']['headers']['content-type'], $data);

            $GLOBALS['_xh']['ac']='';
            //$GLOBALS['_xh']['qt']=''; //unused...
            $GLOBALS['_xh']['stack'] = array();
            $GLOBALS['_xh']['valuestack'] = array();
            $GLOBALS['_xh']['isf']=0; // 0 = OK, 1 for xmlrpc fault responses, 2 = invalid xmlrpc
            $GLOBALS['_xh']['isf_reason']='';
            $GLOBALS['_xh']['rt']=''; // 'methodcall or 'methodresponse'

            // if response charset encoding is not known / supported, try to use
            // the default encoding and parse the xml anyway, but log a warning...
            if (!in_array($resp_encoding, array('UTF-8', 'ISO-8859-1', 'US-ASCII')))
            // the following code might be better for mb_string enabled installs, but
            // makes the lib about 200% slower...
            //if (!is_valid_charset($resp_encoding, array('UTF-8', 'ISO-8859-1', 'US-ASCII')))
            {
                error_log('XML-RPC: '.__METHOD__.': invalid charset encoding of received response: '.$resp_encoding);
                $resp_encoding = $GLOBALS['xmlrpc_defencoding'];
            }
            $parser = xml_parser_create($resp_encoding);
            xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, true);
            // G. Giunta 2005/02/13: PHP internally uses ISO-8859-1, so we have to tell
            // the xml parser to give us back data in the expected charset.
            // What if internal encoding is not in one of the 3 allowed?
            // we use the broadest one, ie. utf8
            // This allows to send data which is native in various charset,
            // by extending xmlrpc_encode_entitites() and setting xmlrpc_internalencoding
            if (!in_array($GLOBALS['xmlrpc_internalencoding'], array('UTF-8', 'ISO-8859-1', 'US-ASCII')))
            {
                xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, 'UTF-8');
            }
            else
            {
                xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $GLOBALS['xmlrpc_internalencoding']);
            }

            if ($return_type == 'phpvals')
            {
                xml_set_element_handler($parser, 'xmlrpc_se', 'xmlrpc_ee_fast');
            }
            else
            {
                xml_set_element_handler($parser, 'xmlrpc_se', 'xmlrpc_ee');
            }

            xml_set_character_data_handler($parser, 'xmlrpc_cd');
            xml_set_default_handler($parser, 'xmlrpc_dh');

            // first error check: xml not well formed
            if(!xml_parse($parser, $data, count($data)))
            {
                // thanks to Peter Kocks <peter.kocks@baygate.com>
                if((xml_get_current_line_number($parser)) == 1)
                {
                    $errstr = 'XML error at line 1, check URL';
                }
                else
                {
                    $errstr = sprintf('XML error: %s at line %d, column %d',
                        xml_error_string(xml_get_error_code($parser)),
                        xml_get_current_line_number($parser), xml_get_current_column_number($parser));
                }
                error_log($errstr);
                $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['invalid_return'], $GLOBALS['xmlrpcstr']['invalid_return'].' ('.$errstr.')');
                xml_parser_free($parser);
                if($this->debug)
                {
                    print $errstr;
                }
                $r->hdrs = $GLOBALS['_xh']['headers'];
                $r->_cookies = $GLOBALS['_xh']['cookies'];
                $r->raw_data = $raw_data;
                return $r;
            }
            xml_parser_free($parser);
            // second error check: xml well formed but not xml-rpc compliant
            if ($GLOBALS['_xh']['isf'] > 1)
            {
                if ($this->debug)
                {
                    /// @todo echo something for user?
                }

                $r = new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['invalid_return'],
                $GLOBALS['xmlrpcstr']['invalid_return'] . ' ' . $GLOBALS['_xh']['isf_reason']);
            }
            // third error check: parsing of the response has somehow gone boink.
            // NB: shall we omit this check, since we trust the parsing code?
            elseif ($return_type == 'xmlrpcvals' && !is_object($GLOBALS['_xh']['value']))
            {
                // something odd has happened
                // and it's time to generate a client side error
                // indicating something odd went on
                $r=new xmlrpcresp(0, $GLOBALS['xmlrpcerr']['invalid_return'],
                    $GLOBALS['xmlrpcstr']['invalid_return']);
            }
            else
            {
                if ($this->debug)
                {
                    print "<PRE>---PARSED---\n";
                    // somehow htmlentities chokes on var_export, and some full html string...
                    //print htmlentitites(var_export($GLOBALS['_xh']['value'], true));
                    print htmlspecialchars(var_export($GLOBALS['_xh']['value'], true));
                    print "\n---END---</PRE>";
                }

                // note that using =& will raise an error if $GLOBALS['_xh']['st'] does not generate an object.
                $v =& $GLOBALS['_xh']['value'];

                if($GLOBALS['_xh']['isf'])
                {
                    /// @todo we should test here if server sent an int and a string,
                    /// and/or coerce them into such...
                    if ($return_type == 'xmlrpcvals')
                    {
                        $errno_v = $v->structmem('faultCode');
                        $errstr_v = $v->structmem('faultString');
                        $errno = $errno_v->scalarval();
                        $errstr = $errstr_v->scalarval();
                    }
                    else
                    {
                        $errno = $v['faultCode'];
                        $errstr = $v['faultString'];
                    }

                    if($errno == 0)
                    {
                        // FAULT returned, errno needs to reflect that
                        $errno = -1;
                    }

                    $r = new xmlrpcresp(0, $errno, $errstr);
                }
                else
                {
                    $r=new xmlrpcresp($v, 0, '', $return_type);
                }
            }

            $r->hdrs = $GLOBALS['_xh']['headers'];
            $r->_cookies = $GLOBALS['_xh']['cookies'];
            $r->raw_data = $raw_data;
            return $r;
        }
    }

    class xmlrpcval
    {
        var $me=array();
        var $mytype=0;
        var $_php_class=null;

        /**
        * @param mixed $val
        * @param string $type any valid xmlrpc type name (lowercase). If null, 'string' is assumed
        */
        function xmlrpcval($val=-1, $type='')
        {
            /// @todo: optimization creep - do not call addXX, do it all inline.
            /// downside: booleans will not be coerced anymore
            if($val!==-1 || $type!='')
            {
                // optimization creep: inlined all work done by constructor
                switch($type)
                {
                    case '':
                        $this->mytype=1;
                        $this->me['string']=$val;
                        break;
                    case 'i4':
                    case 'int':
                    case 'double':
                    case 'string':
                    case 'boolean':
                    case 'dateTime.iso8601':
                    case 'base64':
                    case 'null':
                        $this->mytype=1;
                        $this->me[$type]=$val;
                        break;
                    case 'array':
                        $this->mytype=2;
                        $this->me['array']=$val;
                        break;
                    case 'struct':
                        $this->mytype=3;
                        $this->me['struct']=$val;
                        break;
                    default:
                        error_log("XML-RPC: ".__METHOD__.": not a known type ($type)");
                }
                /*if($type=='')
                {
                    $type='string';
                }
                if($GLOBALS['xmlrpcTypes'][$type]==1)
                {
                    $this->addScalar($val,$type);
                }
                elseif($GLOBALS['xmlrpcTypes'][$type]==2)
                {
                    $this->addArray($val);
                }
                elseif($GLOBALS['xmlrpcTypes'][$type]==3)
                {
                    $this->addStruct($val);
                }*/
            }
        }

        /**
        * Add a single php value to an (unitialized) xmlrpcval
        * @param mixed $val
        * @param string $type
        * @return int 1 or 0 on failure
        */
        function addScalar($val, $type='string')
        {
            $typeof=@$GLOBALS['xmlrpcTypes'][$type];
            if($typeof!=1)
            {
                error_log("XML-RPC: ".__METHOD__.": not a scalar type ($type)");
                return 0;
            }

            // coerce booleans into correct values
            // NB: we should either do it for datetimes, integers and doubles, too,
            // or just plain remove this check, implemented on booleans only...
            if($type==$GLOBALS['xmlrpcBoolean'])
            {
                if(strcasecmp($val,'true')==0 || $val==1 || ($val==true && strcasecmp($val,'false')))
                {
                    $val=true;
                }
                else
                {
                    $val=false;
                }
            }

            switch($this->mytype)
            {
                case 1:
                    error_log('XML-RPC: '.__METHOD__.': scalar xmlrpcval can have only one value');
                    return 0;
                case 3:
                    error_log('XML-RPC: '.__METHOD__.': cannot add anonymous scalar to struct xmlrpcval');
                    return 0;
                case 2:
                    // we're adding a scalar value to an array here
                    //$ar=$this->me['array'];
                    //$ar[]=new xmlrpcval($val, $type);
                    //$this->me['array']=$ar;
                    // Faster (?) avoid all the costly array-copy-by-val done here...
                    $this->me['array'][]=new xmlrpcval($val, $type);
                    return 1;
                default:
                    // a scalar, so set the value and remember we're scalar
                    $this->me[$type]=$val;
                    $this->mytype=$typeof;
                    return 1;
            }
        }

        /**
        * Add an array of xmlrpcval objects to an xmlrpcval
        * @param array $vals
        * @return int 1 or 0 on failure
        * @access public
        *
        * @todo add some checking for $vals to be an array of xmlrpcvals?
        */
        function addArray($vals)
        {
            if($this->mytype==0)
            {
                $this->mytype=$GLOBALS['xmlrpcTypes']['array'];
                $this->me['array']=$vals;
                return 1;
            }
            elseif($this->mytype==2)
            {
                // we're adding to an array here
                $this->me['array'] = array_merge($this->me['array'], $vals);
                return 1;
            }
            else
            {
                error_log('XML-RPC: '.__METHOD__.': already initialized as a [' . $this->kindOf() . ']');
                return 0;
            }
        }

        /**
        * Add an array of named xmlrpcval objects to an xmlrpcval
        * @param array $vals
        * @return int 1 or 0 on failure
        * @access public
        *
        * @todo add some checking for $vals to be an array?
        */
        function addStruct($vals)
        {
            if($this->mytype==0)
            {
                $this->mytype=$GLOBALS['xmlrpcTypes']['struct'];
                $this->me['struct']=$vals;
                return 1;
            }
            elseif($this->mytype==3)
            {
                // we're adding to a struct here
                $this->me['struct'] = array_merge($this->me['struct'], $vals);
                return 1;
            }
            else
            {
                error_log('XML-RPC: '.__METHOD__.': already initialized as a [' . $this->kindOf() . ']');
                return 0;
            }
        }

        // poor man's version of print_r ???
        // DEPRECATED!
        function dump($ar)
        {
            foreach($ar as $key => $val)
            {
                echo "$key => $val<br />";
                if($key == 'array')
                {
                    while(list($key2, $val2) = each($val))
                    {
                        echo "-- $key2 => $val2<br />";
                    }
                }
            }
        }

        /**
        * Returns a string containing "struct", "array" or "scalar" describing the base type of the value
        * @return string
        * @access public
        */
        function kindOf()
        {
            switch($this->mytype)
            {
                case 3:
                    return 'struct';
                    break;
                case 2:
                    return 'array';
                    break;
                case 1:
                    return 'scalar';
                    break;
                default:
                    return 'undef';
            }
        }

        /**
        * @access private
        */
        function serializedata($typ, $val, $charset_encoding='')
        {
            $rs='';
            switch(@$GLOBALS['xmlrpcTypes'][$typ])
            {
                case 1:
                    switch($typ)
                    {
                        case $GLOBALS['xmlrpcBase64']:
                            $rs.="<${typ}>" . base64_encode($val) . "</${typ}>";
                            break;
                        case $GLOBALS['xmlrpcBoolean']:
                            $rs.="<${typ}>" . ($val ? '1' : '0') . "</${typ}>";
                            break;
                        case $GLOBALS['xmlrpcString']:
                            // G. Giunta 2005/2/13: do NOT use htmlentities, since
                            // it will produce named html entities, which are invalid xml
                            $rs.="<${typ}>" . xmlrpc_encode_entitites($val, $GLOBALS['xmlrpc_internalencoding'], $charset_encoding). "</${typ}>";
                            break;
                        case $GLOBALS['xmlrpcInt']:
                        case $GLOBALS['xmlrpcI4']:
                            $rs.="<${typ}>".(int)$val."</${typ}>";
                            break;
                        case $GLOBALS['xmlrpcDouble']:
                            // avoid using standard conversion of float to string because it is locale-dependent,
                            // and also because the xmlrpc spec forbids exponential notation.
                            // sprintf('%F') could be most likely ok but it fails eg. on 2e-14.
                            // The code below tries its best at keeping max precision while avoiding exp notation,
                            // but there is of course no limit in the number of decimal places to be used...
                            $rs.="<${typ}>".preg_replace('/\\.?0+$/','',number_format((double)$val, 128, '.', ''))."</${typ}>";
                            break;
                        case $GLOBALS['xmlrpcDateTime']:
                            if (is_string($val))
                            {
                                $rs.="<${typ}>${val}</${typ}>";
                            }
                            else if(is_a($val, 'DateTime'))
                            {
                                $rs.="<${typ}>".$val->format('Ymd\TH:i:s')."</${typ}>";
                            }
                            else if(is_int($val))
                            {
                                $rs.="<${typ}>".strftime("%Y%m%dT%H:%M:%S", $val)."</${typ}>";
                            }
                            else
                            {
                                // not really a good idea here: but what shall we output anyway? left for backward compat...
                                $rs.="<${typ}>${val}</${typ}>";
                            }
                            break;
                        case $GLOBALS['xmlrpcNull']:
                            if ($GLOBALS['xmlrpc_null_apache_encoding'])
                            {
                                $rs.="<ex:nil/>";
                            }
                            else
                            {
                                $rs.="<nil/>";
                            }
                            break;
                        default:
                            // no standard type value should arrive here, but provide a possibility
                            // for xmlrpcvals of unknown type...
                            $rs.="<${typ}>${val}</${typ}>";
                    }
                    break;
                case 3:
                    // struct
                    if ($this->_php_class)
                    {
                        $rs.='<struct php_class="' . $this->_php_class . "\">\n";
                    }
                    else
                    {
                        $rs.="<struct>\n";
                    }
                    foreach($val as $key2 => $val2)
                    {
                        $rs.='<member><name>'.xmlrpc_encode_entitites($key2, $GLOBALS['xmlrpc_internalencoding'], $charset_encoding)."</name>\n";
                        //$rs.=$this->serializeval($val2);
                        $rs.=$val2->serialize($charset_encoding);
                        $rs.="</member>\n";
                    }
                    $rs.='</struct>';
                    break;
                case 2:
                    // array
                    $rs.="<array>\n<data>\n";
                    for($i=0; $i<count($val); $i++)
                    {
                        //$rs.=$this->serializeval($val[$i]);
                        $rs.=$val[$i]->serialize($charset_encoding);
                    }
                    $rs.="</data>\n</array>";
                    break;
                default:
                    break;
            }
            return $rs;
        }

        /**
        * Returns xml representation of the value. XML prologue not included
        * @param string $charset_encoding the charset to be used for serialization. if null, US-ASCII is assumed
        * @return string
        * @access public
        */
        function serialize($charset_encoding='')
        {
            // add check? slower, but helps to avoid recursion in serializing broken xmlrpcvals...
            //if (is_object($o) && (get_class($o) == 'xmlrpcval' || is_subclass_of($o, 'xmlrpcval')))
            //{
                reset($this->me);
                list($typ, $val) = each($this->me);
                return '<value>' . $this->serializedata($typ, $val, $charset_encoding) . "</value>\n";
            //}
        }

        // DEPRECATED
        function serializeval($o)
        {
            // add check? slower, but helps to avoid recursion in serializing broken xmlrpcvals...
            //if (is_object($o) && (get_class($o) == 'xmlrpcval' || is_subclass_of($o, 'xmlrpcval')))
            //{
                $ar=$o->me;
                reset($ar);
                list($typ, $val) = each($ar);
                return '<value>' . $this->serializedata($typ, $val) . "</value>\n";
            //}
        }

        /**
        * Checks wheter a struct member with a given name is present.
        * Works only on xmlrpcvals of type struct.
        * @param string $m the name of the struct member to be looked up
        * @return boolean
        * @access public
        */
        function structmemexists($m)
        {
            return array_key_exists($m, $this->me['struct']);
        }

        /**
        * Returns the value of a given struct member (an xmlrpcval object in itself).
        * Will raise a php warning if struct member of given name does not exist
        * @param string $m the name of the struct member to be looked up
        * @return xmlrpcval
        * @access public
        */
        function structmem($m)
        {
            return $this->me['struct'][$m];
        }

        /**
        * Reset internal pointer for xmlrpcvals of type struct.
        * @access public
        */
        function structreset()
        {
            reset($this->me['struct']);
        }

        /**
        * Return next member element for xmlrpcvals of type struct.
        * @return xmlrpcval
        * @access public
        */
        function structeach()
        {
            return each($this->me['struct']);
        }

        // DEPRECATED! this code looks like it is very fragile and has not been fixed
        // for a long long time. Shall we remove it for 2.0?
        function getval()
        {
            // UNSTABLE
            reset($this->me);
            list($a,$b)=each($this->me);
            // contributed by I Sofer, 2001-03-24
            // add support for nested arrays to scalarval
            // i've created a new method here, so as to
            // preserve back compatibility

            if(is_array($b))
            {
                @reset($b);
                while(list($id,$cont) = @each($b))
                {
                    $b[$id] = $cont->scalarval();
                }
            }

            // add support for structures directly encoding php objects
            if(is_object($b))
            {
                $t = get_object_vars($b);
                @reset($t);
                while(list($id,$cont) = @each($t))
                {
                    $t[$id] = $cont->scalarval();
                }
                @reset($t);
                while(list($id,$cont) = @each($t))
                {
                    @$b->$id = $cont;
                }
            }
            // end contrib
            return $b;
        }

        /**
        * Returns the value of a scalar xmlrpcval
        * @return mixed
        * @access public
        */
        function scalarval()
        {
            reset($this->me);
            list(,$b)=each($this->me);
            return $b;
        }

        /**
        * Returns the type of the xmlrpcval.
        * For integers, 'int' is always returned in place of 'i4'
        * @return string
        * @access public
        */
        function scalartyp()
        {
            reset($this->me);
            list($a,)=each($this->me);
            if($a==$GLOBALS['xmlrpcI4'])
            {
                $a=$GLOBALS['xmlrpcInt'];
            }
            return $a;
        }

        /**
        * Returns the m-th member of an xmlrpcval of struct type
        * @param integer $m the index of the value to be retrieved (zero based)
        * @return xmlrpcval
        * @access public
        */
        function arraymem($m)
        {
            return $this->me['array'][$m];
        }

        /**
        * Returns the number of members in an xmlrpcval of array type
        * @return integer
        * @access public
        */
        function arraysize()
        {
            return count($this->me['array']);
        }

        /**
        * Returns the number of members in an xmlrpcval of struct type
        * @return integer
        * @access public
        */
        function structsize()
        {
            return count($this->me['struct']);
        }
    }


    // date helpers

    /**
    * Given a timestamp, return the corresponding ISO8601 encoded string.
    *
    * Really, timezones ought to be supported
    * but the XML-RPC spec says:
    *
    * "Don't assume a timezone. It should be specified by the server in its
    * documentation what assumptions it makes about timezones."
    *
    * These routines always assume localtime unless
    * $utc is set to 1, in which case UTC is assumed
    * and an adjustment for locale is made when encoding
    *
    * @param int $timet (timestamp)
    * @param int $utc (0 or 1)
    * @return string
    */
    function iso8601_encode($timet, $utc=0)
    {
        if(!$utc)
        {
            $t=strftime("%Y%m%dT%H:%M:%S", $timet);
        }
        else
        {
            if(function_exists('gmstrftime'))
            {
                // gmstrftime doesn't exist in some versions
                // of PHP
                $t=gmstrftime("%Y%m%dT%H:%M:%S", $timet);
            }
            else
            {
                $t=strftime("%Y%m%dT%H:%M:%S", $timet-date('Z'));
            }
        }
        return $t;
    }

    /**
    * Given an ISO8601 date string, return a timet in the localtime, or UTC
    * @param string $idate
    * @param int $utc either 0 or 1
    * @return int (datetime)
    */
    function iso8601_decode($idate, $utc=0)
    {
        $t=0;
        if(preg_match('/([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})/', $idate, $regs))
        {
            if($utc)
            {
                $t=gmmktime($regs[4], $regs[5], $regs[6], $regs[2], $regs[3], $regs[1]);
            }
            else
            {
                $t=mktime($regs[4], $regs[5], $regs[6], $regs[2], $regs[3], $regs[1]);
            }
        }
        return $t;
    }

    /**
    * Takes an xmlrpc value in PHP xmlrpcval object format and translates it into native PHP types.
    *
    * Works with xmlrpc message objects as input, too.
    *
    * Given proper options parameter, can rebuild generic php object instances
    * (provided those have been encoded to xmlrpc format using a corresponding
    * option in php_xmlrpc_encode())
    * PLEASE NOTE that rebuilding php objects involves calling their constructor function.
    * This means that the remote communication end can decide which php code will
    * get executed on your server, leaving the door possibly open to 'php-injection'
    * style of attacks (provided you have some classes defined on your server that
    * might wreak havoc if instances are built outside an appropriate context).
    * Make sure you trust the remote server/client before eanbling this!
    *
    * @author Dan Libby (dan@libby.com)
    *
    * @param xmlrpcval $xmlrpc_val
    * @param array $options if 'decode_php_objs' is set in the options array, xmlrpc structs can be decoded into php objects; if 'dates_as_objects' is set xmlrpc datetimes are decoded as php DateTime objects (standard is
    * @return mixed
    */
    function php_xmlrpc_decode($xmlrpc_val, $options=array())
    {
        switch($xmlrpc_val->kindOf())
        {
            case 'scalar':
                if (in_array('extension_api', $options))
                {
                    reset($xmlrpc_val->me);
                    list($typ,$val) = each($xmlrpc_val->me);
                    switch ($typ)
                    {
                        case 'dateTime.iso8601':
                            $xmlrpc_val->scalar = $val;
                            $xmlrpc_val->xmlrpc_type = 'datetime';
                            $xmlrpc_val->timestamp = iso8601_decode($val);
                            return $xmlrpc_val;
                        case 'base64':
                            $xmlrpc_val->scalar = $val;
                            $xmlrpc_val->type = $typ;
                            return $xmlrpc_val;
                        default:
                            return $xmlrpc_val->scalarval();
                    }
                }
                if (in_array('dates_as_objects', $options) && $xmlrpc_val->scalartyp() == 'dateTime.iso8601')
                {
                    // we return a Datetime object instead of a string
                    // since now the constructor of xmlrpcval accepts safely strings, ints and datetimes,
                    // we cater to all 3 cases here
                    $out = $xmlrpc_val->scalarval();
                    if (is_string($out))
                    {
                        $out = strtotime($out);
                    }
                    if (is_int($out))
                    {
                        $result = new Datetime();
                        $result->setTimestamp($out);
                        return $result;
                    }
                    elseif (is_a($out, 'Datetime'))
                    {
                        return $out;
                    }
                }
                return $xmlrpc_val->scalarval();
            case 'array':
                $size = $xmlrpc_val->arraysize();
                $arr = array();
                for($i = 0; $i < $size; $i++)
                {
                    $arr[] = php_xmlrpc_decode($xmlrpc_val->arraymem($i), $options);
                }
                return $arr;
            case 'struct':
                $xmlrpc_val->structreset();
                // If user said so, try to rebuild php objects for specific struct vals.
                /// @todo should we raise a warning for class not found?
                // shall we check for proper subclass of xmlrpcval instead of
                // presence of _php_class to detect what we can do?
                if (in_array('decode_php_objs', $options) && $xmlrpc_val->_php_class != ''
                    && class_exists($xmlrpc_val->_php_class))
                {
                    $obj = @new $xmlrpc_val->_php_class;
                    while(list($key,$value)=$xmlrpc_val->structeach())
                    {
                        $obj->$key = php_xmlrpc_decode($value, $options);
                    }
                    return $obj;
                }
                else
                {
                    $arr = array();
                    while(list($key,$value)=$xmlrpc_val->structeach())
                    {
                        $arr[$key] = php_xmlrpc_decode($value, $options);
                    }
                    return $arr;
                }
            case 'msg':
                $paramcount = $xmlrpc_val->getNumParams();
                $arr = array();
                for($i = 0; $i < $paramcount; $i++)
                {
                    $arr[] = php_xmlrpc_decode($xmlrpc_val->getParam($i));
                }
                return $arr;
            }
    }

    // This constant left here only for historical reasons...
    // it was used to decide if we have to define xmlrpc_encode on our own, but
    // we do not do it anymore
    if(function_exists('xmlrpc_decode'))
    {
        define('XMLRPC_EPI_ENABLED','1');
    }
    else
    {
        define('XMLRPC_EPI_ENABLED','0');
    }

    /**
    * Takes native php types and encodes them into xmlrpc PHP object format.
    * It will not re-encode xmlrpcval objects.
    *
    * Feature creep -- could support more types via optional type argument
    * (string => datetime support has been added, ??? => base64 not yet)
    *
    * If given a proper options parameter, php object instances will be encoded
    * into 'special' xmlrpc values, that can later be decoded into php objects
    * by calling php_xmlrpc_decode() with a corresponding option
    *
    * @author Dan Libby (dan@libby.com)
    *
    * @param mixed $php_val the value to be converted into an xmlrpcval object
    * @param array $options can include 'encode_php_objs', 'auto_dates', 'null_extension' or 'extension_api'
    * @return xmlrpcval
    */
    function php_xmlrpc_encode($php_val, $options=array())
    {
        $type = gettype($php_val);
        switch($type)
        {
            case 'string':
                if (in_array('auto_dates', $options) && preg_match('/^[0-9]{8}T[0-9]{2}:[0-9]{2}:[0-9]{2}$/', $php_val))
                    $xmlrpc_val = new xmlrpcval($php_val, $GLOBALS['xmlrpcDateTime']);
                else
                    $xmlrpc_val = new xmlrpcval($php_val, $GLOBALS['xmlrpcString']);
                break;
            case 'integer':
                $xmlrpc_val = new xmlrpcval($php_val, $GLOBALS['xmlrpcInt']);
                break;
            case 'double':
                $xmlrpc_val = new xmlrpcval($php_val, $GLOBALS['xmlrpcDouble']);
                break;
                // <G_Giunta_2001-02-29>
                // Add support for encoding/decoding of booleans, since they are supported in PHP
            case 'boolean':
                $xmlrpc_val = new xmlrpcval($php_val, $GLOBALS['xmlrpcBoolean']);
                break;
                // </G_Giunta_2001-02-29>
            case 'array':
                // PHP arrays can be encoded to either xmlrpc structs or arrays,
                // depending on wheter they are hashes or plain 0..n integer indexed
                // A shorter one-liner would be
                // $tmp = array_diff(array_keys($php_val), range(0, count($php_val)-1));
                // but execution time skyrockets!
                $j = 0;
                $arr = array();
                $ko = false;
                foreach($php_val as $key => $val)
                {
                    $arr[$key] = php_xmlrpc_encode($val, $options);
                    if(!$ko && $key !== $j)
                    {
                        $ko = true;
                    }
                    $j++;
                }
                if($ko)
                {
                    $xmlrpc_val = new xmlrpcval($arr, $GLOBALS['xmlrpcStruct']);
                }
                else
                {
                    $xmlrpc_val = new xmlrpcval($arr, $GLOBALS['xmlrpcArray']);
                }
                break;
            case 'object':
                if(is_a($php_val, 'xmlrpcval'))
                {
                    $xmlrpc_val = $php_val;
                }
                else if(is_a($php_val, 'DateTime'))
                {
                    $xmlrpc_val = new xmlrpcval($php_val->format('Ymd\TH:i:s'), $GLOBALS['xmlrpcStruct']);
                }
                else
                {
                    $arr = array();
                    reset($php_val);
                    while(list($k,$v) = each($php_val))
                    {
                        $arr[$k] = php_xmlrpc_encode($v, $options);
                    }
                    $xmlrpc_val = new xmlrpcval($arr, $GLOBALS['xmlrpcStruct']);
                    if (in_array('encode_php_objs', $options))
                    {
                        // let's save original class name into xmlrpcval:
                        // might be useful later on...
                        $xmlrpc_val->_php_class = get_class($php_val);
                    }
                }
                break;
            case 'NULL':
                if (in_array('extension_api', $options))
                {
                    $xmlrpc_val = new xmlrpcval('', $GLOBALS['xmlrpcString']);
                }
                else if (in_array('null_extension', $options))
                {
                    $xmlrpc_val = new xmlrpcval('', $GLOBALS['xmlrpcNull']);
                }
                else
                {
                    $xmlrpc_val = new xmlrpcval();
                }
                break;
            case 'resource':
                if (in_array('extension_api', $options))
                {
                    $xmlrpc_val = new xmlrpcval((int)$php_val, $GLOBALS['xmlrpcInt']);
                }
                else
                {
                    $xmlrpc_val = new xmlrpcval();
                }
            // catch "user function", "unknown type"
            default:
                // giancarlo pinerolo <ping@alt.it>
                // it has to return
                // an empty object in case, not a boolean.
                $xmlrpc_val = new xmlrpcval();
                break;
            }
            return $xmlrpc_val;
    }

    /**
    * Convert the xml representation of a method response, method request or single
    * xmlrpc value into the appropriate object (a.k.a. deserialize)
    * @param string $xml_val
    * @param array $options
    * @return mixed false on error, or an instance of either xmlrpcval, xmlrpcmsg or xmlrpcresp
    */
    function php_xmlrpc_decode_xml($xml_val, $options=array())
    {
        $GLOBALS['_xh'] = array();
        $GLOBALS['_xh']['ac'] = '';
        $GLOBALS['_xh']['stack'] = array();
        $GLOBALS['_xh']['valuestack'] = array();
        $GLOBALS['_xh']['params'] = array();
        $GLOBALS['_xh']['pt'] = array();
        $GLOBALS['_xh']['isf'] = 0;
        $GLOBALS['_xh']['isf_reason'] = '';
        $GLOBALS['_xh']['method'] = false;
        $GLOBALS['_xh']['rt'] = '';
        /// @todo 'guestimate' encoding
        $parser = xml_parser_create();
        xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, true);
        // What if internal encoding is not in one of the 3 allowed?
        // we use the broadest one, ie. utf8!
        if (!in_array($GLOBALS['xmlrpc_internalencoding'], array('UTF-8', 'ISO-8859-1', 'US-ASCII')))
        {
            xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, 'UTF-8');
        }
        else
        {
            xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $GLOBALS['xmlrpc_internalencoding']);
        }
        xml_set_element_handler($parser, 'xmlrpc_se_any', 'xmlrpc_ee');
        xml_set_character_data_handler($parser, 'xmlrpc_cd');
        xml_set_default_handler($parser, 'xmlrpc_dh');
        if(!xml_parse($parser, $xml_val, 1))
        {
            $errstr = sprintf('XML error: %s at line %d, column %d',
                        xml_error_string(xml_get_error_code($parser)),
                        xml_get_current_line_number($parser), xml_get_current_column_number($parser));
            error_log($errstr);
            xml_parser_free($parser);
            return false;
        }
        xml_parser_free($parser);
        if ($GLOBALS['_xh']['isf'] > 1) // test that $GLOBALS['_xh']['value'] is an obj, too???
        {
            error_log($GLOBALS['_xh']['isf_reason']);
            return false;
        }
        switch ($GLOBALS['_xh']['rt'])
        {
            case 'methodresponse':
                $v =& $GLOBALS['_xh']['value'];
                if ($GLOBALS['_xh']['isf'] == 1)
                {
                    $vc = $v->structmem('faultCode');
                    $vs = $v->structmem('faultString');
                    $r = new xmlrpcresp(0, $vc->scalarval(), $vs->scalarval());
                }
                else
                {
                    $r = new xmlrpcresp($v);
                }
                return $r;
            case 'methodcall':
                $m = new xmlrpcmsg($GLOBALS['_xh']['method']);
                for($i=0; $i < count($GLOBALS['_xh']['params']); $i++)
                {
                    $m->addParam($GLOBALS['_xh']['params'][$i]);
                }
                return $m;
            case 'value':
                return $GLOBALS['_xh']['value'];
            default:
                return false;
        }
    }

    /**
    * decode a string that is encoded w/ "chunked" transfer encoding
    * as defined in rfc2068 par. 19.4.6
    * code shamelessly stolen from nusoap library by Dietrich Ayala
    *
    * @param string $buffer the string to be decoded
    * @return string
    */
    function decode_chunked($buffer)
    {
        // length := 0
        $length = 0;
        $new = '';

        // read chunk-size, chunk-extension (if any) and crlf
        // get the position of the linebreak
        $chunkend = strpos($buffer,"\r\n") + 2;
        $temp = substr($buffer,0,$chunkend);
        $chunk_size = hexdec( trim($temp) );
        $chunkstart = $chunkend;
        while($chunk_size > 0)
        {
            $chunkend = strpos($buffer, "\r\n", $chunkstart + $chunk_size);

            // just in case we got a broken connection
            if($chunkend == false)
            {
                $chunk = substr($buffer,$chunkstart);
                // append chunk-data to entity-body
                $new .= $chunk;
                $length += strlen($chunk);
                break;
            }

            // read chunk-data and crlf
            $chunk = substr($buffer,$chunkstart,$chunkend-$chunkstart);
            // append chunk-data to entity-body
            $new .= $chunk;
            // length := length + chunk-size
            $length += strlen($chunk);
            // read chunk-size and crlf
            $chunkstart = $chunkend + 2;

            $chunkend = strpos($buffer,"\r\n",$chunkstart)+2;
            if($chunkend == false)
            {
                break; //just in case we got a broken connection
            }
            $temp = substr($buffer,$chunkstart,$chunkend-$chunkstart);
            $chunk_size = hexdec( trim($temp) );
            $chunkstart = $chunkend;
        }
        return $new;
    }

    /**
    * xml charset encoding guessing helper function.
    * Tries to determine the charset encoding of an XML chunk received over HTTP.
    * NB: according to the spec (RFC 3023), if text/xml content-type is received over HTTP without a content-type,
    * we SHOULD assume it is strictly US-ASCII. But we try to be more tolerant of unconforming (legacy?) clients/servers,
    * which will be most probably using UTF-8 anyway...
    *
    * @param string $httpheaders the http Content-type header
    * @param string $xmlchunk xml content buffer
    * @param string $encoding_prefs comma separated list of character encodings to be used as default (when mb extension is enabled)
    *
    * @todo explore usage of mb_http_input(): does it detect http headers + post data? if so, use it instead of hand-detection!!!
    */
    function guess_encoding($httpheader='', $xmlchunk='', $encoding_prefs=null)
    {
        // discussion: see http://www.yale.edu/pclt/encoding/
        // 1 - test if encoding is specified in HTTP HEADERS

        //Details:
        // LWS:           (\13\10)?( |\t)+
        // token:         (any char but excluded stuff)+
        // quoted string: " (any char but double quotes and cointrol chars)* "
        // header:        Content-type = ...; charset=value(; ...)*
        //   where value is of type token, no LWS allowed between 'charset' and value
        // Note: we do not check for invalid chars in VALUE:
        //   this had better be done using pure ereg as below
        // Note 2: we might be removing whitespace/tabs that ought to be left in if
        //   the received charset is a quoted string. But nobody uses such charset names...

        /// @todo this test will pass if ANY header has charset specification, not only Content-Type. Fix it?
        $matches = array();
        if(preg_match('/;\s*charset\s*=([^;]+)/i', $httpheader, $matches))
        {
            return strtoupper(trim($matches[1], " \t\""));
        }

        // 2 - scan the first bytes of the data for a UTF-16 (or other) BOM pattern
        //     (source: http://www.w3.org/TR/2000/REC-xml-20001006)
        //     NOTE: actually, according to the spec, even if we find the BOM and determine
        //     an encoding, we should check if there is an encoding specified
        //     in the xml declaration, and verify if they match.
        /// @todo implement check as described above?
        /// @todo implement check for first bytes of string even without a BOM? (It sure looks harder than for cases WITH a BOM)
        if(preg_match('/^(\x00\x00\xFE\xFF|\xFF\xFE\x00\x00|\x00\x00\xFF\xFE|\xFE\xFF\x00\x00)/', $xmlchunk))
        {
            return 'UCS-4';
        }
        elseif(preg_match('/^(\xFE\xFF|\xFF\xFE)/', $xmlchunk))
        {
            return 'UTF-16';
        }
        elseif(preg_match('/^(\xEF\xBB\xBF)/', $xmlchunk))
        {
            return 'UTF-8';
        }

        // 3 - test if encoding is specified in the xml declaration
        // Details:
        // SPACE:         (#x20 | #x9 | #xD | #xA)+ === [ \x9\xD\xA]+
        // EQ:            SPACE?=SPACE? === [ \x9\xD\xA]*=[ \x9\xD\xA]*
        if (preg_match('/^<\?xml\s+version\s*=\s*'. "((?:\"[a-zA-Z0-9_.:-]+\")|(?:'[a-zA-Z0-9_.:-]+'))".
            '\s+encoding\s*=\s*' . "((?:\"[A-Za-z][A-Za-z0-9._-]*\")|(?:'[A-Za-z][A-Za-z0-9._-]*'))/",
            $xmlchunk, $matches))
        {
            return strtoupper(substr($matches[2], 1, -1));
        }

        // 4 - if mbstring is available, let it do the guesswork
        // NB: we favour finding an encoding that is compatible with what we can process
        if(extension_loaded('mbstring'))
        {
            if($encoding_prefs)
            {
                $enc = mb_detect_encoding($xmlchunk, $encoding_prefs);
            }
            else
            {
                $enc = mb_detect_encoding($xmlchunk);
            }
            // NB: mb_detect likes to call it ascii, xml parser likes to call it US_ASCII...
            // IANA also likes better US-ASCII, so go with it
            if($enc == 'ASCII')
            {
                $enc = 'US-'.$enc;
            }
            return $enc;
        }
        else
        {
            // no encoding specified: as per HTTP1.1 assume it is iso-8859-1?
            // Both RFC 2616 (HTTP 1.1) and 1945 (HTTP 1.0) clearly state that for text/xxx content types
            // this should be the standard. And we should be getting text/xml as request and response.
            // BUT we have to be backward compatible with the lib, which always used UTF-8 as default...
            return $GLOBALS['xmlrpc_defencoding'];
        }
    }

    /**
    * Checks if a given charset encoding is present in a list of encodings or
    * if it is a valid subset of any encoding in the list
    * @param string $encoding charset to be tested
    * @param mixed $validlist comma separated list of valid charsets (or array of charsets)
    */
    function is_valid_charset($encoding, $validlist)
    {
        $charset_supersets = array(
            'US-ASCII' => array ('ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3', 'ISO-8859-4',
                'ISO-8859-5', 'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8',
                'ISO-8859-9', 'ISO-8859-10', 'ISO-8859-11', 'ISO-8859-12',
                'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'UTF-8',
                'EUC-JP', 'EUC-', 'EUC-KR', 'EUC-CN')
        );
        if (is_string($validlist))
            $validlist = explode(',', $validlist);
        if (@in_array(strtoupper($encoding), $validlist))
            return true;
        else
        {
            if (array_key_exists($encoding, $charset_supersets))
                foreach ($validlist as $allowed)
                    if (in_array($allowed, $charset_supersets[$encoding]))
                        return true;
                return false;
        }
    }

?>