Summon

private function summonPenguin($penguin, $arguments) {
                if($penguin->moderator) {
                        list($username) = $arguments;
                        $username = strtolower($username);
                        foreach($this->server->penguins as $aPenguin) {
                                if(strtolower($aPenguin->username) == $username) {
                                        $this->server->joinRoom($aPenguin, $penguin->room->externalId);
                                        break;
                                }
                        }
                }
        }