Retrieve user friends who don't like a specific page

Hi everyone, Someone has already created me a drupal module which serves me to retrieve my user facebook friends. I can access to user friend_likes, i modified it, i just need to do a loop inside the array of friend/likes which will output me only my facebook friends who don't like a certain page id. This has to be very simple for a php developer, i almost reached to do it on my own, i can print the array of friend_likes, but i need it to be properly done. And has to be very quick.