ช่วยแก้ตรงที่ error ให้หน่อยค่ะ Warning: escapeshellcmd() has been disabled for security reasons

class AjaxWhois{

    var $serverList;
    var $tr = 0;

function CheckWhois($domain){
		
		return "
		<a href=\"#\" onclick=\"javascript:makeRequest('get.php', '?domain=$domain');\">Whois</a>
		";

}

<?php 
require_once("AjaxWhois.php"); 
$whois = new AjaxWhois();
?>

<?php 
echo '<fieldset><legend class="green">Whois results</legend><div align="left">';
$domain=escapeshellcmd($_GET['domain']);
$cmd="/usr/bin/whois $domain";

exec($cmd,$data);
$max=count($data);
$count=0;
if($max):
    while($count <= $max):
        echo "$data[$count]<br>";   
        if(ereg("Whois Server: ", $data[$count])):
                $whoserver=ereg_replace("Whois Server: ", "", $data[$count]);
        endif;
        $count++;
    endwhile;
endif;