php filter email

function save($data,$name){
    $fopn = fopen($name, "a+");
    fwrite($data."\r\n", $fopn);
    fclose($fopn);
}
$file = explode("\r\n", file_get_contents("filname.txt"));
foreach ($file as $key => $email) {
    if(eregi("gmail.com", $email)){
        save($email,"gmail.txt");
        echo $email."\r\n";
    }
    if(eregi("yahoo.com", $email)){
        save($email,"yahoo.txt");
        echo $email."\r\n";
    }
}