Facebook Login using PHP SDK 4.0.0 with additional permissions

fb_login_4.0.php

<?php
// include code from https://gist.github.com/niraj-shah/ab1c74ad83df172e6075

// generate login url with scope, each permission as element in array
$loginUrl = $helper->getLoginUrl( array( 'email', 'user_friends' ) );

// output login link
echo '<a href="' . $loginUrl . '">Login</a>';