<?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.
}