In function static function Facebook_login(), the code will validate if the facebook user has already registered on wordpress by running this query,
$users = get_users(array(
'meta_key' => c_al2fb_meta_facebook_id,
'meta_value' => $me->id
));
But in wordpress 3.3 and above version, 'meta_key' is prefixed with "blog_'blog_id'_" in usermeta table. So before running above query, c_al2fb_meta_facebook_id need to be prefixed with correct blog id.
add following code before this query to fix it,
//phu fix bug of multisite wrong meta facebook id
$c_al2fb_meta_facebook_id = c_al2fb_meta_facebook_id;
if (is_multisite()) {
global $blog_id;
$c_al2fb_meta_facebook_id = "blog_".$blog_id."_".$c_al2fb_meta_facebook_id;
}
And then use the variable $c_al2fb_meta_facebook_id to replace the constant c_al2fb_meta_facebook_id in the following queries.
Peidong
