php对Email（邮箱地址）进行强验证实现方法

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/**
 * php对Email（邮箱地址）进行强验证的代码
 *
 * @param 
 * @arrange 512-笔记网： 512Pic.com
 **/
<?php
/* 
 *  __construct($email)     takes an email address to check 
 *  
 * simpleCheck()            Tests to see if an email address is formatted correctly 
 *                          and the domain it belongs to exists, such as: gmail.com, yahoo.com 
 *  
 * strongCheck()            Tests to see if an email address is valid and that the 
 *                          email actually accepts emails by actually connecting to the server. 
 *                          Note: strongCheck() can be slow 
 */
class EmailValidator{
	private $email  = ""; 
	private $mxhost = "";
	public function __construct($email){ 
		$this->email  = $email; 
		$this->mxhost = $this->getMXHost(); 
	}
	public function strongCheck(){ 
		if(filter_var($this->email, FILTER_VALIDATE_EMAIL) && $this->fConnect()){ 
			return true; 
		} 
		return false; 
	}
	public function simpleCheck(){ 
		if(filter_var($this->email, FILTER_VALIDATE_EMAIL) && $this->getMXHost()){ 
			return true; 
		} 
		return false; 
	}
	private function fConnect(){ 
		$fp             = @fsockopen($this->mxhost, 25, $errno, $errstr, 5); 
		$ms_resp        = ""; 
		$b_server_found = false; 
		if($fp){ 
			$ms_resp .= $this->send_command($fp, "HELO hi"); 
			$ms_resp .= $this->send_command($fp, "MAIL FROM:<ryan@ryannaddy.com>"); 
			$rcpt_text = $this->send_command($fp, "RCPT TO:<{$this->email}>"); 
			$ms_resp .= $rcpt_text; 
			if(substr($rcpt_text, 0, 3) == "250"){ 
				$b_server_found = true; 
			} 
			$ms_resp .= $this->send_command($fp, "QUIT"); 
			fclose($fp); 
		} 
		return $b_server_found; 
	}
	private function getMXHost(){ 
		if(!empty($this->mxhost)){ 
			return $this->mxhost; 
		} 
		list($user, $domain) = explode("@", $this->email); 
		getmxrr($domain, $hosts, $weights); 
		$priority = mt_getrandmax(); 
		$key      = 0; 
		if(empty($weights)){ 
			return false; 
		} 
		foreach($weights as $k => $v){ 
			if($v < $priority){ 
				$key      = $k; 
				$priority = $v; 
			} 
		} 
		return $hosts[$key]; 
	}
	private function send_command($fp, $out){ 
		fwrite($fp, $out . "\r\n"); 
		return $this->get_data($fp); 
	}
	private function get_data($fp){ 
		$s = ""; 
		stream_set_timeout($fp, 2); 
		for($i = 0; $i < 2; $i++){ 
			$s .=fgets($fp, 1024); 
		} 
		return $s; 
	}
}
$hosts = array( 
	"asdfsfd@adsfasdasd.com", 
	"asdfsfd@google.com", 
	"asdf!sfd@gmail.com", 
	"asdfsfd@yahoo.com", 
	"asd^sfd@44n5o$.com", 
	"dddasdf@gamil.com" 
);
foreach($hosts as $host){ 
	echo $host . "\n"; 
	$em = new EmailValidator($host); 
	echo "    "; 
	var_dump($em->simpleCheck()); 
	echo "    "; 
	var_dump($em->strongCheck()); 
}

/***   来自php教程（www.idcnote.com）   ***/

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