How to check IF user has ALREADY liked the facebook page?

Question

I have a like button on my website (which is for users to like the fb fan page).

If the user clicks like, I check to see if the even has been fired (event subscribe)

Answer 1

If you use the facebook php API. i've came up with this short function that u can include inside the base_facebook.php file into the class BaseFacebook.

public function userIsFan() {
    $sr = $this->getSignedRequest();
    if($sr && is_array($sr)){
        if(array_key_exists('page', $sr)){
            return $sr['page']['liked'] == 1;
        }
    }
    return 0;
}