check if variable empty

Question

if ($user_id == NULL || $user_name == NULL || $user_logged == NULL) {
    $user_id = \'-1\';
    $user_name = NULL;
    $user_logged = NULL;
}
if ($user_admin == NUL         


        

Answer 1

empty() is a little shorter, as an alternative to checking !$user_id as suggested elsewhere:

if (empty($user_id) || empty($user_name) || empty($user_logged)) {
}