code: public static function sendHipChatMessage($room, $token, $text, $notify = true, $format = 'text')
      {
          $session = curl_init();
          curl_setopt($session, CURLOPT_URL, 'https://api.hipchat.com/v2/room/' . $room . '/notification?auth_token=' . $token);
          curl_setopt($session, CURLOPT_POST, 1);
          curl_setopt(
              $session,
              CURLOPT_POSTFIELDS,
              http_build_query(
                  [
                      'message' => $text,
                      'message_format' => $format,
                      'notify' => $notify,
                  ]
              )
          );
  
          curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
          curl_exec($session);
          curl_close($session);
      }
docs: Send message to HipChat room
  
  @param string $room Room name or ID
  @param string $token Token
  @param string $text Message body
  @param bool $notify Determine if should notify users
  @param string $format Format of message