PHP 代码：【复制】 
function build_text_body($body) { 
        return "n<pre>".$this->make_link_clickable($this->linesize(htmlspecialchars($body),85))."</pre>n"; 
    } 

    function decode_qp($text) { 
        $text = quoted_printable_decode($text); 
        /* 
        $text = str_replace("r","",$text); 
        $text = ereg_replace("=n", "", $text); 
        $text = str_replace("n","rn",$text); 
        */ 
        $text = ereg_replace("=r", "r", $text); 
        return $text; 
    } 

    function make_link_clickable($text){ 
        $text = eregi_replace("([[:alnum:]]+)://([^[:space:]]*)([[:alnum:]#?/&=])", 
            "<a class="autolink" href="\1://\2\3" target="_new">\1://\2\3</a>", $text); 
        $text = eregi_replace("([0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\.[a-z]{2,3})","<a class="autolink"  href="newmsg.php?mailto=\1&nameto=\1">\1</a>", $text); 
        return $text; 
    } 

    function process_message($header,$body) { 
        global $mime_show_html; 
        $mail_info = $this->get_mail_info($header); 

        $ctype = $mail_info["content-type"]; 
        $ctenc = $mail_info["content-transfer-encoding"]; 

        if($ctype == "") $ctype = "text/plain"; 

        $type = $ctype; 

        $ctype = split(";",$ctype); 
        $types = split("/",$ctype[0]); 

        $maintype = strtolower($types[0]); 
        $subtype = strtolower($types[1]); 

        switch($maintype) { 
        case "text": 
            $body = $this->compile_body($body,$ctenc); 
            switch($subtype) { 
            case "html": 
                if(!$mime_show_html) 
                    $body = $this->build_text_body(strip_tags($body)); 
                $msgbody = $body; 
                break; 
            default: 
                $msgbody = $this->build_text_body($body); 
                break; 
            } 
            break; 
        case "multipart": 
            switch($subtype) { 
            case "mixed": 
                $boundary = $this->get_boundary($type); 
                $part = $this->split_parts($boundary,$body); 

                for($i=0;$i<count($part);$i++) { 
                    $thispart = trim($part[$i]); 

                    if($thispart != "") { 
                        $email = $this->fetch_structure($thispart); 
     
                        $header = $email["header"]; 
                        $body = $email["body"]; 
                        $headers = $this->decode_header($header); 
                        $ctype = $headers["content-type"]; 
     
                        $Actype = split(";",$headers["content-type"]); 
                        $types = split("/",$Actype[0]); $rctype = strtolower($Actype[0]); 
     
                        if($rctype == "multipart/alternative") 
                            $msgbody = $this->build_alternative_body($ctype,$body); 
                        elseif($rctype == "text/plain" && strpos($headers["content-disposition"],"name") === false) { 
                            $msgbody = $this->build_text_body($this->compile_body($body,$headers["content-transfer-encoding"])); 
                        } elseif($rctype == "text/html" && strpos($headers["content-disposition"],"name") === false) { 
                            $body = $this->compile_body($body,$headers["content-transfer-encoding"]); 
                            if(!$mime_show_html) 
                                $body = $this->build_text_body(strip_tags($body)); 
                            $msgbody = $body; 
                        } elseif($rctype == "multipart/related" && strpos($headers["content-disposition"],"name") === false) { 
                            $msgbody = $this->build_related_body($ctype,$body); 
                        } else { 
                            $thisattach = $this->build_attach($header,$body,$boundary,$i); 
                        } 
                    } 
                } 
                break; 
            case "alternative": 
                $msgbody = $this->build_alternative_body($ctype[1],$body); 
                break; 
            case "related": 
                $msgbody = $this->build_related_body($type,$body); 
                break; 
            default: 
                $thisattach = $this->build_attach($header,$body,"",0); 
            } 
            break; 
        default: 
            $thisattach = $this->build_attach($header,$body,"",0); 
        } 
        return $msgbody; 
    } 

    function build_attach($header,$body,$boundary,$part) { 
        global $mail,$temporary_directory,$userfolder; 

        $headers = $this->decode_header($header); 
        $cdisp = $headers["content-disposition"]; 
        $ctype = $headers["content-type"]; $ctype2 = explode(";",$ctype); $ctype2 = $ctype2[0]; 
         
        $Atype = split("/",$ctype); 
        $Acdisp = split(";",$cdisp); 

        $tenc = $headers["content-transfer-encoding"]; 

        if($temp) $dir_to_save = $userfolder; //"temporary_files/"; 

        if($Atype[0] == "message") { 
            $divpos = strpos($body,"nr"); 
            $attachheader = substr($body,0,$divpos); 
            $attachheaders = $this->decode_header($attachheader); 
            $filename = $this->decode_mime_string($attachheaders["subject"]); 
            if($filename == "") 
                $filename = uniqid(""); 
            $filename = substr(ereg_replace("[^A-Za-z0-9]","_",$filename),0,20).".eml"; 
        } else { 
            $fname = $Acdisp[1]; 
            $filename = substr($fname,strpos($fname,"filename=")+9,strlen($fname)); 
            if($filename == "")  
                $filename = substr($ctype,strpos($ctype,"name=")+5,strlen($ctype)); 
            if(substr($filename,0,1) == """ && substr($filename,-1) == """) 
                $filename = substr($filename,1,strlen($filename)-2); 
            $filename = $this->decode_mime_string($filename); 
        } 


        if($Atype[0] != "message") 
            $body = $this->compile_body($body,$tenc); 

        $indice = count($this->content["attachments"]); 
        $this->content["attachments"][$indice]["name"] = $filename; 
        $this->content["attachments"][$indice]["size"] = strlen($body); 
        $this->content["attachments"][$indice]["temp"] = $temp; 
        $this->content["attachments"][$indice]["content-type"] = $ctype2; //$Atype[0]; 
        $this->content["attachments"][$indice]["content-disposition"] = $Acdisp[0]; 
        $this->content["attachments"][$indice]["boundary"] = $boundary; 
        $this->content["attachments"][$indice]["part"] = $part; 
        return $this->content["attachments"][$indice]; 
    } 

    function compile_body($body,$enctype) { 
        $enctype = explode(" ",$enctype); $enctype = $enctype[0]; 
        if(strtolower($enctype) == "base64") 
            $body = base64_decode($body); 
        elseif(strtolower($enctype) == "quoted-printable") 
            $body = $this->decode_qp($body); 
        return $body; 

    } 

    function download_attach($header,$body,$down=1) { 
        $headers = $this->decode_header($header); 

        $cdisp = $headers["content-disposition"]; 
        $ctype = $headers["content-type"]; 

        $type = split(";",$ctype); $type = $type[0]; 
        $Atype = split("/",$ctype); 
        $Acdisp = split(";",$cdisp); 
        $tenc = strtolower($headers["content-transfer-encoding"]); 

        if($Atype[0] == "message") { 
            $divpos = strpos($body,"nr"); 
            $attachheader = substr($body,0,$divpos); 
            $attachheaders = $this->decode_header($attachheader); 
            $filename = $this->decode_mime_string($attachheaders["subject"]); 
            if($filename == "") 
                $filename = uniqid(""); 
            $filename = substr(ereg_replace("[^A-Za-z0-9]","_",$filename),0,20); 
            $filename .= ".eml"; 
        } else { 
            $fname = $Acdisp[1]; 
            $filename = substr($fname,strpos(strtolower($fname),"filename=")+9,strlen($fname)); 
            if($filename == "")  
                $filename = substr($ctype,strpos(strtolower($ctype),"name=")+5,strlen($ctype)); 
            if(substr($filename,0,1) == """ && substr($filename,-1) == """) 
                $filename = substr($filename,1,strlen($filename)-2); 
            $filename = $this->decode_mime_string($filename); 
        } 

        if($Atype[0] != "message") 
            $body = $this->compile_body($body,$tenc); 

        $content_type = ($down)?"application/octet-stream":strtolower($type); 
        $filesize = strlen($body); 

        header("Content-Type: $content_type; name="$filename"rn" 
        ."Content-Length: $filesizern"); 
        $cdisp = ($down)?"attachment":"inline"; 
        header("Content-Disposition: $cdisp; filename="$filename"rn"); 
        echo($body); 
    } 

    function get_mail_info($header) { 
        $myarray = Array(); 
        $headers = $this->decode_header($header); 

        /* 
        echo("<pre>"); 
        print_r($headers); 
        echo("</pre>"); 
        */ 

        $message_id = $headers["message-id"]; 

        if(substr($message_id,0,1) == "<" && substr($message_id,-1) == ">") 
            $message_id = substr($message_id,1,strlen($message_id)-2); 

        $myarray["content-type"] = $headers["content-type"]; 
        $myarray["content-transfer-encoding"] = str_replace("GM","-",$headers["content-transfer-encoding"]); 
        $myarray["message-id"] = $message_id; 

        $received = $headers["received"]; 

        if($received != "") { 
            $received = explode(";",$received); 
            $mydate = $received[1]; 
        } else 
            $mydate = $headers["date"]; 

        $myarray["date"] = $this->build_mime_date($mydate); 
        $myarray["subject"] = $this->decode_mime_string($headers["subject"]); 
        $myarray["from"] = $this->get_names($headers["from"]); 
        $myarray["to"] = $this->get_names($headers["to"]); 
        $myarray["cc"] = $this->get_names($headers["cc"]); 
        $myarray["status"] = $headers["status"]; 
        $myarray["read"] = ($headers["status"] == "N")?0:1; 

        return $myarray; 

    } 

    function build_mime_date($mydate) { 

        $mydate = explode(",",$mydate);  
        $mydate = trim($mydate[count($mydate)-1]); 
        $parts = explode(" ",$mydate); 
        if(count($parts) < 4) { return time(); } 
        $day = $parts[0]; 

        switch(strtolower($parts[1])) { 
            case "jan": $mon = 1; break; 
            case "feb":    $mon = 2; break; 
            case "mar":    $mon = 3; break; 
            case "apr":    $mon = 4; break; 
            case "may":    $mon = 5; break; 
            case "jun": $mon = 6; break; 
            case "jul": $mon = 7; break; 
            case "aug": $mon = 8; break; 
            case "sep": $mon = 9; break; 
            case "oct": $mon = 10; break; 
            case "nov": $mon = 11; break; 
            case "dec": $mon = 12; break; 
        } 
         
        $year = $parts[2]; 
        $ahours = explode(":",$parts[3]); 
        $hour = $ahours[0]; $min = $ahours[1]; $sec = $ahours[2]; 

        return mktime ($hour, $min, $sec, $mon, $day, $year); 

    } 

    function initialize($email) { 
        $email = $this->fetch_structure($email); 
        $body = $email["body"]; 
        $header = $email["header"]; 
        $mail_info = $this->get_mail_info($header); 

        $this->content["headers"] = $header; 
        $this->content["date"] = $mail_info["date"]; 
        $this->content["subject"] = $mail_info["subject"]; 
        $this->content["message-id"] = $mail_info["message-id"]; 
        $this->content["from"] = $mail_info["from"]; 
        $this->content["to"] = $mail_info["to"]; 
        $this->content["cc"] = $mail_info["cc"]; 
        $this->content["body"] = $this->process_message($header,$body); 
        $this->content["read"] = $mail_info["read"]; 
    } 

    function split_parts($boundary,$body) { 
        $startpos = strpos($body,"$boundary")+strlen("$boundary")+2; 
        $lenbody = strpos($body,"rn$boundary--") - $startpos; 
        $body = substr($body,$startpos,$lenbody); 
        return split($boundary."rn",$body); 
    } 

    function get_boundary($ctype){ 
        $boundary = trim(substr($ctype,strpos(strtolower($ctype),"boundary=")+9,strlen($ctype))); 
        $boundary = split(";",$boundary);$boundary = $boundary[0]; 

        if(substr($boundary,0,1) == """ && substr($boundary,-1) == """) 
            $boundary = substr($boundary,1,strlen($boundary)-2); 
        $boundary = "--".$boundary; 
        return $boundary; 
    } 

    function set_as($email,$type=1) { 
        $status = ($type)?"Y":"N"; 
        $tempmail = $this->fetch_structure($email); 
        $thisheader = $tempmail["header"]; 
        $mail_info = $this->get_mail_info($thisheader); 
        $decoded_headers = $this->decode_header($thisheader); 

        while(list($key,$val) = each($decoded_headers)) 
            if (eregi("status",$key)) { 
                $newmail .= ucfirst($key).": $statusrn"; $headerok = 1; 
            } else $newmail .= ucfirst($key).": ".trim($val)."rn"; 
        if(!$headerok) $newmail .= "Status: $statusrn"; 
        $newmail = trim($newmail)."rnrn".trim($tempmail["body"]); 
        return $newmail; 
    } 

}