Like/Dislike Fanpages Facebook

<?php
$signed_request = $_REQUEST["signed_request"];

list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
// var_dump($data);die();
$pageLiked = $data['page']['liked'];
if($pageLiked){
	header('Location: like-on.html');
}
else{
	header('Location: like-off.html');
}
?>