各位。PHP能否实现这样的功能

以下代码可以！<? 
class CEmail { 
//var $email_regular_expression="^([a-z0-9_]|-|.)+@(([a-z0-9_]|-)+.)+[a-z]{2,4}$";
//var $email_regular_expression="^[_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3}$";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;$host<count($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 VerifyOnline($email) 
{ 
if(!$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($connection); 
} 
} 
return(-1); 
} function Verify($email,$type=0) 
{ 
if($type==0) return $this->VerifyRule($email) ; 
else return $this->VerifyOnline($email) ; } }if($ocp)
{
//用法: 
$m=new CEmail; 
//僅檢查語法 
//if($m->Verify("[email protected]",0)) echo "有效"; 
//else echo "無效"; //線上檢查是否真的有該Email 
if($m->Verify("$ocp",1)) echo "有效"; 
else echo " $ocp 無效"; 
}
else
{
echo 

"
<form method=POST action=$PHP_SELF>
   <p>
   <input type=text name=ocp size=20>
   <input type=submit value=提交 name=B1>
   </p>
</form>
";
}
?>