php验证email是否真实存在

sosqrn975

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 = "aa@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 && $this->utLine($connection,"HELO $localhost") && $this->VerifyResultLines($connection,"250")>0 && $this->utLine($connection,"MAIL FROM: <[url=mailtolocaluser@$localhost]$localuser@$localhost[/url]>") && $this->VerifyResultLines($connection,"250")>0 && $this->utLine($connection,"RCPT TO: <$email>") && ($result=$this->VerifyResultLines($connection,"250"))>=0)
{
fclose($connection);
return($result);
}
fclose($connection);
}
}
return(-1);
}
};
?>

pianist_cu

3楼正解，目前大部分网站都是用发邮件的方式来验证，web设计的原则就是遵循已被验证过的正确的方法。

maochanglu

发一封email过去。里面有验证的链接。

satrun7

现在的新人，在论坛上连代码都不会贴了，一看上面的代码就直接让人晕。