<?php
$cloaked_url = "URL"; // devs go here
$normal_url = "URL"; // everyone else goes here
$tracking_ref = $_SERVER['HTTP_REFERER'];
if(strpos($tracking_ref,"dev.facebook")){
Header( "HTTP/1.1 301 Moved Permanently" );
Header( "Location: " . $cloaked_url );
} else {
Header( "HTTP/1.1 301 Moved Permanently" );
Header( "Location: " . $normal_url );
}
?>