FacebookRestClient::fql_query PHP Method

    public function fql_query($query)
    {
        return $this->call_method('facebook.fql.query', array('query' => $query));
    }

<?php

require_once 'facebook-client/facebook.php';
require_once 'facebook-client/facebookapi_php5_restlib.php';
$appapikey = '{YOUR API KEY HERE}';
$appsecret = '{YOUR APPLICATION SECRET KEY HERE}';
// do this after validation
$userid = $_REQUEST['fb_sig_user'];
$sKey = $_REQUEST['fb_sig_session_key'];
if ($_REQUEST['action'] == "getName") {
    try {
        $fbClient = new FacebookRestClient($appapikey, $appsecret, $sKey);
    } catch (FacebookRestClientException $ex) {
        // Handle Exception
    }
    $userInfo = $fbClient->fql_query("SELECT name FROM user WHERE uid={$userid}");
    $userName = $userInfo[0]['name'];
    // $userName now contains user's name.
}