如何通过PHP代码获得Facebook关注者

Question

<?php
$FBFollowercount = file_get_contents('http://api.facebook.com/method/fql.query?format=json&query=select+fan_count+from+page+where+page_id%3D355692061120689');
$data = json_decode($FBFollow);
echo $data[0]->fan_count;
?>