Compare post levels and user levels wishlist member

I’m using Wishlist Member plugin and I’m building a function which compares user_levels and post_levels, but I can’t get my function to work:

check_user_access($userid, $postid){

     // get user_levels
     $user_levels = WLMAPI::GetUserLevels($userid);

     // get the post levels
     $post_levels = WLMAPI::GetPostLevels($postid);

     // Compare user_levels with post_level
     $result = array_search($user_levels, $post_levels);

     if ($result === false) {
         return false;
     }
     else {
         return true;
     }

 }

Maybe because $user_levels is an array?

Try something like:

// Compare user_levels with post_level
$result="";
foreach($user_levels as $user_level) {
    $result .= array_search($user_level, $post_levels);
}
if ($result) {
    return true;
}