‎$facebook = new Facebook("publickey", "secretkey");
$user_id = $facebook->require_login();
$user_details = $facebook->api_client->users_getInfo($user_id, 'name, first_name, last_name, pic_small, profile_url');

if (!is_array($user_details)...) {
$data['first_name'] = '';
$data['last_name'] = '';
$data['name'] = '';
$data['pic_small'] = '';
$data['profile_url'] = '';
}
else
{
$data['first_name'] = $user_details[0]['first_name'];
$data['last_name'] = $user_details[0]['last_name'];
$data['name'] = $user_details[0]['name'];
$data['pic_small'] = $user_details[0]['pic_small'];
$data['profile_url'] = $user_details[0]['profile_url'];
$_SESSION['username'] = $data['name'];
$name = $data['name'];
$me = "me";
}

hope it'll help uSee More