Check whether the php verification mailbox actually exists

Hello everyone, I am a beginner in php. if you have any questions, please check whether the email address actually exists during registration. thank you; environment win32 + php5.45test. php & lt ;? Phpecho & nbsp; "& lt; center & gt; & lt; br/& gt; check php to verify whether the email address actually exists.
Hello everyone, I am a beginner in php. if you have any questions, please check whether the email address actually exists during registration. thank you.

Environment win32 + php5.45

Test. php

 Echo"
 
  
Check whether the email address is correct:
  
";
  
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 "you are not sure if your mailbox is correct. Is your mailbox too far away from here?
  
";
  
Return;
  
} Else {
  
Echo & quot; 22222222 & quot ";
  
If (! $ Result ){
  
Echo "the email address you entered is incorrect! :)
  
";
  
Return;
  
} Else {
  
Echo "the email address is valid!
  
";
  
}
  
}
  

  
?>
  

 

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
 $mxhosts[$weights[$host]]=$hosts[$host]; 
KSort($mxhosts); 
for(Reset($mxhosts),$host=0;$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;$host
 { 
if(($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); 
} 
}; 

?> 

Share:
------ Solution --------------------
I don't understand. my idea is to check whether the format is correct at most, and then send an activation code to his mailbox like everyone else to complete the last step of registration. You want to verify it directly, unless the email service provider provides an interface for you to verify. Otherwise.
------ Solution --------------------
The authenticity of an email cannot be determined, although any email server has the mailbox list function. But most of them are not open to the outside world.
You need to activate registration via email. it looks good. But it is based on the professional ethics of the website administrator. The advertising emails you receive are like this.