- if (!$user_a || !$user_b) {
- $this->client_error(_('Two user ids or screen_names must be supplied.'), 400, $apidata['content-type']);
+ if (empty($user_a) || empty($user_b)) {
+ $this->clientError(_('Two user ids or screen_names must be supplied.'),
+ 400, $apidata['content-type']);