一个简单的（也可以说是不完全的）IMAP类和应用。（一）

<?php
//by Alpha.Z
//05/21/2000

class myimap
{
        var    $username="";
        var    $userpwd="";
        var    $hostname="";
        var    $port=0;
        var    $connection=0;            //是否连接
        var    $state="DISCONNECTED";        //连接状态
        var    $greeting="";            
        var    $must_update=0;
        var    $inStream=0;

    Function open()
    {
        if ($this->port==110)
            $this->inStream=imap_open("{$this->hostname/pop3:110}inbox",$this->username,$this->userpwd);
        else
            $this->inStream=imap_open("{$this->hostname/imap:143}inbox",$this->username,$this->userpwd);

        if ($this->inStream)
        {
            echo "用户：$this->username 的信箱连接成功。<br>";
            return $inStream;
        }
        else
        {
            echo "用户：$this->username 的信箱连接失败。<br>";
            return 0;
        }
    }
    
    Function close()
    {
        if(imap_close($this->inStream))
        {
            echo "<hr>已经与服务器 $this->hostname 断开连接。";
            return 1;
        }
        else
        {
            echo "<hr>与服务器 $this->hostname 断开连接失败。";
            return 0;
        }
    }
    
    Function CheckMailbox()
    {
        $mboxinfo=@imap_mailboxmsginfo($this->inStream);
        //$mboxinfo=imap_check($this->inStream);
        if ($mboxinfo)
            if ($mboxinfo->Nmsgs>0)
            {
                echo "您的收件箱里共有邮件数：".$mboxinfo->Nmsgs."<br>";
                echo "未读邮件数：".$mboxinfo->Unread."<br>";
                //echo "新邮件数：".$mboxinfo->Rescent."<br>";
                echo "总共占用空间：".$mboxinfo->Size."字节<br>";
                echo "最新邮件日期：".$mboxinfo->Date."<br><hr>";
            }
            else
            {
                echo "您的信箱里没有邮件。<br><hr>";
            }
        else
        {
            echo '<font color="RED">错误：无法获取收件箱的信息。</font>';
        }

        echo '<table border="1">';
        $sortby="SORTDATE";
        $sort_reverse=1;
        $sorted = imap_sort($this->inStream, $sortby, $sort_reverse, SE_UID);

        for ($i=1;$i<=$mboxinfo->Nmsgs;$i++)
        {
            $msgHeader = @imap_header($this->inStream, imap_msgno($this->inStream, $sorted[$i-1]));
            //日期
            if (isset($msgHeader->date))
            {
                $date = $msgHeader->date;
                if (ord($date) > 64)
                    $date = substr($date, 5);
                while (strstr('  ', $date))
                {
                    $date = str_replace('  ', ' ', $date);
                }
            }

            if (isset($msgHeader->from[0]))
            {
                $from = $msgHeader->from[0];
                    if (isset($from->personal))
                    {
                        $frm = trim($from->personal);
                    }
                    else
                        if (isset($from->mailbox) && isset($from->host))
                        {
                            $frm = $from->mailbox . '@' . $from->host;
                        }
                        else
                            if (isset($msgHeader->fromaddress))
                                $frm = trim($h->fromaddress);
            }
            else
                if (isset($msgHeader->fromaddress))
                    $frm = trim($msgHeader->fromaddress);

            if (isset($msgHeader->toaddress))
                $to = trim($msgHeader->toaddress);
            else
                $to = "未知";
                           

            if (isset($msgHeader->subject))
                $sub = trim($this->decode_mime_string($msgHeader->subject));
            if (isset($msgHeader->Size))
                $msg_size = ($msgHeader->Size > 1024) ? sprintf("%.0f kb", $msgHeader->Size / 1024) : $msgHeader->Size;
            if (strlen($frm) > 50)
                $frm = substr($frm, 0, 50) . '...';
            if (strlen($sub) > 50)
                $sub = substr($sub, 0, 50) . '...';

            echo '<tr>';
            echo '<td align="center"><input type="checkbox" name="check"></td><td>'.$frm.'</td><td><a href="showbody_imap.php?usr='.$this->username.'&pwd='.$this->userpwd.'&msg='.$i.'">'.$sub.'</a></td><td>'.$date.'</td><td>'.$msg_size.'</td>';
            echo '</tr>';
        }
        echo "</table>";
    }
    
    Function decode_mime_string ($string)
    {
        $pos = strpos($string, '=?');
        if (!is_int($pos))
        {
            return $string;
        }

        $preceding = substr($string, 0, $pos); // save any preceding text

        $search = substr($string, $pos+2, 75); // the mime header spec says this is the longest a single encoded word can be
        $d1 = strpos($search, '?');
        if (!is_int($d1))
        {
            return $string;
        }

        $charset = substr($string, $pos+2, $d1);
        $search = substr($search, $d1+1);

        $d2 = strpos($search, '?');
        if (!is_int($d2))
        {
            return $string;
        }

        $encoding = substr($search, 0, $d2);
        $search = substr($search, $d2+1);

        $end = strpos($search, '?=');
        if (!is_int($end))
        {
            return $string;
        }

        $encoded_text = substr($search, 0, $end);
        $rest = substr($string, (strlen($preceding . $charset . $encoding . $encoded_text)+6));

        switch ($encoding)
        {
            case 'Q':
            case 'q':
                $encoded_text = str_replace('_', '%20', $encoded_text);
                $encoded_text = str_replace('=', '%', $encoded_text);
                $decoded = urldecode($encoded_text);
                break;

            case 'B':
            case 'b':
                $decoded = urldecode(base64_decode($encoded_text));
                break;

            default:
                $decoded = '=?' . $charset . '?' . $encoding . '?' . $encoded_text . '?=';
                break;
        }

        return $preceding . $decoded . decode_mime_string($rest);
    }

    Function display_toaddress ($user, $server, $from)
    {
        return is_int(strpos($from, $this->get_barefrom($user, $server)));
    }
        
    Function get_barefrom($user, $server)
    {
        $barefrom = "$user@$real_server";

        return $barefrom;
    }        
    
    Function get_structure($msg_num)
    {
        $structure=imap_fetchstructure($this->inStream,$msg_num);
        //echo gettype($structure);
        return $structure;
    }

    Function proc_structure($msg_part, $part_no, $msg_num)
    {
        if ($msg_part->ifdisposition)
        {
        // See if it has a disposition
        // The only thing I know of that this
        // would be used for would be an attachment
        // Lets check anyway
            if ($msg_part->disposition == "ATTACHMENT")
            {
                // If it is an attachment, then we let people download it
                // First see if they sent a filename
                $att_name = "unknown";
                for ($lcv = 0; $lcv <count($msg_part->parameters); $lcv++)
                {
                    $param = $msg_part->parameters[$lcv];

                    if ($param->attribute == "NAME")
                    {
                        $att_name = $param->value;
                                    break;
                    }
                }

                // You could give a link to download the attachment here....
                echo '<a href="'.$att_name.'">'.$att_name.'</a><br>';
                $fp=fopen(".$att_name","w+");
                fputs($fp,imap_base64(imap_fetchbody($this->inStream,$msg_num,$part_no)));
                fclose($fp);
            }
            else
            {
                // I guess it is used for something besides attachments????
            }
        }
        else
        {
            // Not an attachment, lets see what this part is...
            switch ($msg_part->type)
            {
                case TYPETEXT:
                    $mime_type = "text";
                    break;
                case TYPEMULTIPART:
                    $mime_type = "multipart";
                    // Hey, why not use this function to deal with all the parts
                    // of this multipart part :)
                    for ($i = 0; $i <count($msg_part->parts); $i++)
                    {
                        if ($part_no != "")
                        {
                            $part_no = $part_no.".";
                        }
                        for ($i = 0; $i <count($msg_part->parts); $i++)
                        {
                            $this->proc_structure($msg_part->parts[$i], $part_no.($i + 1), $msg_num);
                        }
                    }
                    break;
                case TYPEMESSAGE:
                    $mime_type = "message";
                    break;
                case TYPEAPPLICATION:
                    $mime_type = "application";
                    break;
                case TYPEAUDIO:
                    $mime_type = "audio";
                    break;
                case TYPEIMAGE:
                    $mime_type = "image";
                    break;
                case TYPEVIDEO:
                    $mime_type = "video";
                    break;
                case TYPEMODEL:
                    $mime_type = "model";
                    break;
                default:
                    $mime_type = "unknown";
                    // hmmm....
            }

            $full_mime_type = $mime_type."/".$msg_part->subtype;
            //echo $full_mime_type.'<hr>';

            // Decide what you what to do with this part
            // If you want to show it, figure out the encoding and echo away
            switch ($msg_part->encoding)
            {
                case ENCBASE64:
                // use imap_base64 to decode
                    $fp=fopen(".$att_name","w+");
                    fputs($fp,imap_base64(imap_fetchbody($this->inStream,$msg_num,$part_no)));
                    fclose($fp);
                    break;
                case ENCQUOTEDPRINTABLE:
                // use imap_qprint to decode
                    //echo ereg_replace("n","<br>",imap_qprint(imap_fetchbody($this->inStream,$msg_num,$part_no)));
                    echo '<pre>'.imap_qprint(imap_fetchbody($this->inStream,$msg_num,$part_no)).'</pre>';
                    break;
                case ENCOTHER:
                // not sure if this needs decoding at all
                    break;
                default:
            }
        }
    }

};

?>
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