php验证信箱是否真实存在

php验证邮箱是否真实存在
大家好，我是php新手，现在有个问题想请教大家，就是注册时验证该email地址是否真的存在，谢谢 

环境win32+php5.45

test.php

<?php

echo "<center><br/>检查电子邮件地址的正确性:<br/>"; 

require("email_validation.php"); 

$newmail = "283285993@qq.com"; 

$validator=new email_validation_class; 

$validator->timeout=10; 



//if(IsSet($newemail) && strcmp($newemail,"")){

	if( ($result=$validator->ValidateEmailBox($newmail) )<0){ 

		echo "不能确定您的信箱是否正确. 您的信箱离这里太远了吧?<br/>"; 

		return; 

	}else{ 

			echo "22222222";

		if(!$result){ 

			echo "您输入的信箱地址是不正确的! :)<br/>"; 

			return; 

		}else{

			echo "邮箱合法!<br/>"; 

		} 

	}



?>

email_validation.php

<? 

class email_validation_class 

{ 

//var $email_regular_expression="^([a-z0-9_] |//- |//.)+@(([a-z0-9_] |//-)+//.)+[a-z]{2,4}$"; 

var $timeout=0; 

var $localhost=""; 

var $localuser=""; 

var $hosts=0;



Function GetLine($connection) 

{ 

for($line="";;) 

{ 

if(feof($connection)) 

return(0); 

$line.=fgets($connection,100); 

$length=strlen($line); 

if($length>=2 && substr($line,$length-2,2)=="/r/n") 

return(substr($line,0,$length-2)); 

} 

} 



Function PutLine($connection,$line) 

{ 

return(fputs($connection,"$line/r/n")); 

} 



Function ValidateEmailAddress($email) { 

//return(eregi($this->email_regular_expression,$email)!=0); 

//origin:

//return(eregi("^([a-z0-9_] |//- |//.)+@(([a-z0-9_] |//-)+//.)+[a-z]{2,4}$",$email)!=0); 



//return preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $_REQUEST[$email]);

return preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/", $_REQUEST[$email]);



} 



Function ValidateEmailHost($email,$hosts=0) 

{ 

if(!$this->ValidateEmailAddress($email)) 

return(0); 

$user=strtok($email,"@"); 

$domain=strtok(""); 

if(GetMXRR($domain,$hosts,$weights)) 

{ 

$mxhosts=array(); 

for($host=0;$host<count($hosts);$host++) 

$mxhosts[$weights[$host]]=$hosts[$host]; 

KSort($mxhosts); 

for(Reset($mxhosts),$host=0;$host<count($mxhosts);Next($mxhosts),$host++) 

$hosts[$host]=$mxhosts[Key($mxhosts)]; 

} 

else 

{ 

$hosts=array(); 

if(strcmp(@gethostbyname($domain),$domain)!=0) 

$hosts[]=$domain; 

} 

return(count($hosts)!=0); 

} 



Function VerifyResultLines($connection,$code) 

{ 

while(($line=$this->GetLine($connection))) 

{ 

if(!strcmp(strtok($line," "),$code)) 

return(1); 

if(strcmp(strtok($line,"-"),$code)) 

return(0); 

} 

return(-1); 

} 



Function ValidateEmailBox($email) 

{ 

if(!$this->ValidateEmailHost($email,$hosts)) 

return(0); 

if(!strcmp($localhost=$this->localhost,"") && !strcmp($localhost=getenv("SERVER_NAME"),"") && !strcmp($localhost=getenv("HOST"),"")) 

$localhost="localhost"; 

if(!strcmp($localuser=$this->localuser,"") && !strcmp($localuser=getenv("USERNAME"),"") && !strcmp($localuser=getenv("USER"),"")) 

$localuser="root"; 

for($host=0;$host<count($hosts);$host++) 

{ 

if(($connection=($this->timeout ? fsockopen($hosts[$host],25,$errno,$error,$this->timeout) : fsockopen($hosts[$host],25)))) 

{ 

if($this->VerifyResultLines($connection,"220")>0 && $this->PutLine($connection,"HELO $localhost") && $this->VerifyResultLines($connection,"250")>0 && $this->PutLine($connection,"MAIL FROM: <$localuser@$localhost>") && $this->VerifyResultLines($connection,"250")>0 && $this->PutLine($connection,"RCPT TO: <$email>") && ($result=$this->VerifyResultLines($connection,"250"))>=0) 

{ 

fclose($connection); 

return($result); 

} 

fclose($connection); 

} 

} 

return(-1); 

} 

}; 



?> 

------解决方案--------------------
不懂，我的想法就是，最多验证一下格式是否正确，然后像大家一样，往他邮箱发激活码，用以完成注册的最后一步。你想要直接验证，除非邮箱服务商提供接口让你验证。不然。
------解决方案--------------------
email 的真实性是无法判断的，虽然任何一个邮件服务器都有邮箱列表功能。但大多都不会对外开放
需要用邮件激活注册，看上去不错。但是建立在网站管理员的职业道德上的。你收到的那些广告邮件就是这样来的