code: public function clientGetByUid($uid)
      {
          foreach ($this->clientList() as $client) {
              if ($client["client_unique_identifier"] == $uid) {
                  return $client;
              }
          }
  
          throw new Ts3Exception("invalid clientID", 0x200);
      }
docs: Returns the Client object matching the given unique identifier.
  
  @param  string $uid
  @throws Ts3Exception
  @return Client