add.php decoded - part1

<?php
function checkemail( $email )
{
    $isValid = true;
    $atIndex = strrpos( $email, "@" );
    if ( is_bool( $atIndex ) && !$atIndex )
    {
        $isValid = false;
    }
    else
    {
        $domain = substr( $email, $atIndex + 1 );
        $local = substr( $email, 0, $atIndex );
        $localLen = strlen( $local );
        $domainLen = strlen( $domain );
        if ( $localLen < 1 || 64 < $localLen )
        {
            $isValid = false;
        }
        else if ( $domainLen < 1 || 255 < $domainLen )
        {
            $isValid = false;
        }
        else if ( $local[0] == "." || $local[$localLen - 1] == "." )
        {
            $isValid = false;
        }
        else if ( preg_match( "/\\.\\./", $local ) )
        {
            $isValid = false;
        }
        else if ( !preg_match( "/^[A-Za-z0-9\\-\\.]+\$/", $domain ) )
        {
            $isValid = false;
        }
        else if ( preg_match( "/\\.\\./", $domain ) )
        {
            $isValid = false;
        }
        else if ( !preg_match( "/^(\\\\.|[A-Za-z0-9!#%&`_=\\/\$'*+?^{}|~.-])+\$/", str_replace( "\\\\", "", $local ) ) && !preg_match( "/^\"(\\\\\"|[^\"])+\"\$/", str_replace( "\\\\", "", $local ) ) )
        {
            $isValid = false;
        }
        if ( $isValid && !( checkdnsrr( $domain, "MX" ) || checkdnsrr( $domain, "A" ) ) )
        {
            $isValid = false;
        }
    }
    return $isValid;
}

header( "Cache-Control: no-cache" );
header( "Expires: -1" );
$add = 1;
if ( !$add && $disable )
{
    echo "<form name=adduser method=post action=\"add_user.php\"><table><input type=hidden name=add value=1><!--<input type=hidden name=ip value=";
    echo $ip;
    echo ">--><tr><td>Username :</td><td> <input type=text name=username /></td></tr><tr><td>Password : </td><td><input type=text name=password /></td></tr><tr><td>Jobs Allowed : </td><td><input type=text name=jobs_allowed /></td></tr><tr><td>Account Type : </td><td>";
    echo "<S";
    echo "elect name=type><option value=0>Free</option><option value=1>\$5 Paid</option></select></td></tr><!--<tr><td>User ID :</td><td> <input type=text name=userids />";
    echo "<s";
    echo "mall>(seperated by ; in same sequence for aboce usernames, seperated by ;)</small></td><t/r><tr><td>Password : </td><td><input type=text name=password />";
    echo "<s";
    echo "mall>(Must be same for all Usernames Given above)</small></td></tr><tr><td>Keywords To Post For : </td><td><input type=text name=keywords />";
    echo "<s";
    echo "mall>(seperated by ;)</small></td></tr><tr><td>Forum Type :</td><td> ";
    echo "<s";
    echo "elect name=forumtype>  <option name=phpbb3 value=phpbb3>phpBB 3</option> <option name=smf value=smf>SMF</option> <option name=vbulletin value=vbulletin>vBulletin</option> </select></td></tr><tr><td>Number of Posts to Make :</td><td><input type=text name=numofposts value=20></td></tr>--><tr><td></td><td><input type=Submit value=Feed Job></td></tr></table></form>";
    echo "";
}
else if ( $add )
{
    include_once( "./connect.php" );
    $sql = "SELECT * FROM `users`;";
    if ( !( $res = mysql_query( $sql, $link ) ) )
    {
        exit( mysql_error( )."<- this time" );
    }
    $count = mysql_num_rows( $res );
    $email = $_POST['email'];
    $password = $_POST['password'];
    $jobs_allowed = $_POST['jobs_allowed'];
    $type = $_POST['type'];
    if ( checkemail( $email ) )
    {
        $go = 1;
    }
    else
    {
        $go = 0;
        header( "Location: index.php?err=bademail" );
        echo "<br>Bad Email Address";
        exit( );
    }
    if ( strlen( $password ) < 5 )
    {
        header( "Location: index.php?err=badpassword" );
        exit( );
    }
    if ( $type != 1 )
    {
        $type = 0;
    }
    switch ( $type )
    {
    case "0" :
        $data = array( "0", "3", "30" );
        break;
    case "1" :
        $data = array( "1", "8", "300" );
    }
//========================================PAYMENT==============================================//