PHP 邮箱验证类 正则匹配并域名验证

<?php
 /**
  * function getmxrr
  * 获取指定域名的MX记录信息
 */
 function win_getmxrr($hostname, &$mxhosts, &$mxweight=false) 
 {
    if (strtoupper(substr(PHP_OS, 0, 3)) != 'WIN') return;
    if (!is_array ($mxhosts) ) $mxhosts = array();
    if (empty($hostname)) return;
    $exec='nslookup -type=MX '.escapeshellarg($hostname);
    @exec($exec, $output);
    if (empty($output)) return;
    $i=-1;
    foreach ($output as $line) {
        $i++;
        if (preg_match("/^$hostname\tMX preference = ([0-9]+), mail exchanger = (.+)$/i", $line, $parts)) {
          $mxweight[$i] = trim($parts[1]);
          $mxhosts[$i] = trim($parts[2]);
        }
        if (preg_match('/responsible mail addr = (.+)$/i', $line, $parts)) {
          $mxweight[$i] = $i;
          $mxhosts[$i] = trim($parts[1]);
        }
    }
    return ($i!=-1);
 }
 if (!function_exists('getmxrr')) {
    function getmxrr($hostname, &$mxhosts, &$mxweight=false) {
        return win_getmxrr($hostname, $mxhosts, $mxweight);
    }
 }
 
 /**
  * class EmailLinker
  * 邮箱验证类，正则匹配邮箱地址并对域名是否有MX解析进行验证
 */ 
 class EmailLinker
 {
     CONST CONN_TIMEOUT = 10;
     CONST READ_TIMEOUT = 5;
     CONST SMTP_PORT = 25;
     private $email;
     function __construct($email)
     {
         $this->email = $email;
         $this->redirectIfNeeded();
     }
     //重定向邮箱地址
     function redirectIfNeeded()
     {
         if(array_key_exists('mail',$_GET) && $this->email == base64_decode($_GET['mail']) ){
             header('Location: mailto:'.$this->email);
             exit;
         }    
     }
 
     //回调返回邮箱地址
     public function link()
     {
         if($this->isValid()){
             $encoded = base64_encode($this->email);
             return '<a href="?mail='.urlencode($encoded).'" target="_blank">Email:'.$this->email.'</a>';
         }
     }
     //获取邮箱地址并验证
     public function isValid($mail = '')
     {
             static $valid = null;
             if($mail){
                 return ( $this->getParts() != null );
             }
             if($valid !== null){
                 return $valid;
             }
             if($parts = $this->getParts()){
                 $valid = $this->validateUser($parts['host'],$parts['user']);
             }
             return $valid;
     }
     private function validateUser($hostname,$user)
     {
         if($sock = $this->openSMTPSocket($hostname)){
             $this->smtpSend($sock,"HELO $hostname");
             $resp  = $this->smtpSend($sock,"MALL FROM: <$user@$hostname>");
             //$resp  = $this->smtpSend($sock,"RCPT TO:<$user@$hostname>"); //这一步可能被ISP过滤了，导致邮箱验证不成功
             $vaild = (preg_match('/250|451|452\s/',$resp) == 1);
             fclose($sock);
             return $vaild;
         }else{
             return false;
         }
     }
     private function openSMTPSocket($hostname)
     {
         $hosts = $this->getMX($hostname);
         foreach($hosts as $host => $weight)
         {
             if($sock = @fsockopen($host,self::SMTP_PORT,$errno,$errstr,self::CONN_TIMEOUT))
             {
                 stream_set_timeout($sock,self::READ_TIMEOUT);
                 return $sock;
             }
         }
     }
     private function getMX($hostname)
     {
         $host = array();
         $weights = array();
         getmxrr($hostname,$hosts,$weights);
 
         $results = array();
         foreach($hosts as $i => $host)
         {
             $results[$host] = $weights[$i];
         }
         arsort($results,SORT_NUMERIC);
         $results[$hostname] = 0;
         return $results;
     }
     private function smtpSend($sock,$data)
     {
         fwrite($sock,"$data\r\n");
         return fgets($sock,1024);
     }
     
     //正则匹配
     private function getParts()
     {
         //$emailRegex = '/\w+([-+.]\w+)*@\w+([-.]\w)*\.\w+([-.]\w+)*/x';
         $emailRegex = <<<__REGEX__
         /(?P<user>
             \w+([-+.]\w+)*
          )@(?P<host>
              \w+([-.]\w)*\.\w+([-.]\w+)*
          )/x
 __REGEX__;
         return (preg_match($emailRegex,$this->email,$matches))? $matches : null ;
     }
 
 }
 $emailLinker_class = new EmailLinker('421865564@qq.com');
 echo $emailLinker_class->link();
 
 
 
 ?>

源代码下载：EmailLinker_1228.zip