Comprehensive test of email effectiveness_PHP tutorial

Generally, we often hope that friends who visit your website can leave emails
But many people will type casually, causing trouble for administrators.
The following class can check online whether the email is a valid email (whether it exists or not) )

class CEmail {
var $email_regular_expression="^([a-z0-9_]|-|.)+@(([a-z0-9_]| - )+.)+[a-z]{2,4}$";
var $timeout=0;
var $localhost="";
var $localuser="";

Function GetLine($connection)
{
for($line="";;)
{
if(feof($connection))
return(0);
$line.=fgets($connection,100);
$length=strlen($line);
if($length>=2
&& substr($line,$length-2,2 ) ==="rn")
return(substr($line,0,$length-2));
}
}

Function PutLine($connection,$line)
{
return(fputs($connection,"$linern"));
}

Function VerifyRule($email)
{
return(eregi($this- > ;email_regular_expression,$email)!=0);
}

Function ValidateEmailHost($email,$hosts=0)
{
if(!$this->VerifyRule( $ 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,"-"),$code))
return(0);
}
return(-1); > ;ValidateEmailHost($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")



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