Verificare corectitudine email

<?php

/**
 * @author r3vyk
 * @copyright 2011
 */

$ar=array();
$mail=array();
$op=fopen("email.txt","r");

while(!feof($op))
    $ar[]=fgets($op); 
for($i=0;$i<count($ar);$i++)
    {
        if(ereg("^[-A-Za-z0-9_]+[-A-Za-z0-9_.]*[@]{1}[-A-Za-z0-9_]+[-A-Za-z0-9_.]*[.]{1}[A-Za-z]{2,5}$", trim($ar[$i]))) 
            {
                $mail[]=$ar[$i];
                echo $ar[$i].'<br>';
            }

    }
    
$af='<font color="green"><b>Numarul de e-mailuri valide este de :'; 
$af.=count($mail); 
$af.='</b></font>';
echo $af;
?>