Someone

<?
	$newDomainName="google.com";

        $badDomains[]="google.com";
        $badDomains[]="msn.com";
        $badDomains[]="gmail.com";
        $badDomains[]="yahoo.com";
        $badDomains[]="hotmail.com";
        
        if(array_search($newDomainName, $badDomains)) {
		die("matched");
        }

?>