Return list of current Facebook user's friends PHP

Question

I am working on a Facebook app that will allows users to vote on their favorite pictures, based on their friend's profiles pictures. I know how to display the images, just not how to get the list of the current user's friend's IDs. My application is written in PHP. This is the last thing I need to complete the app. Any help would be great!

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This is my code: (Just to display each user ID on the page)

<?php
include_once 'facebook.php';
$apikey = 'API KEY HERE';
$secretkey = 'SECRET KEY HERE';

$fbObj = new Facebook($apikey, $secretkey);

$myuid = $fbObj->require_login();

$friends = $fbObj->api('$myuid/friends');
echo $friends;
?>

That code raises the following PHP error:

PHP Fatal error:  Call to undefined method Facebook::api() in /home/zach/public_html/Majik/animated.php on line 10