fanowanie.php

<?php
    function parsePageSignedRequest() {
        if (isset($_REQUEST['signed_request'])) {
            $encoded_sig = $payload = null;
            list($encoded_sig, $payload) = explode('.', $_REQUEST['signed_request'], 2);
            $sig = base64_decode(strtr($encoded_sig, '-_', '+/'));
            $data = json_decode(base64_decode(strtr($payload, '-_', '+/'), true));
            return $data;
        }
        return false;
    }
    $is_fan = false;
    if($signed_request = parsePageSignedRequest()) {
        if($signed_request->page->liked and signed_request->page->id=="PAGEID_TO_BE_LIKED") $is_fan = true;
    }
?>