PHP curl login website

I need help with a remote login on a website. It's just a simple form with username and password, and I try to login with curl like this: <?php $data = array( "user" => "***", "pass" => "***" ); $ch = curl_init($url); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, $data); curl_setopt($ch, CURLOPT_COOKIEJAR, '[login to view URL]'); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $result = curl_exec($ch); curl_close($ch); echo $result; ?> But it's not working. I need quick assistance.