sendEvent example

while (true) {
            if (connection_status() !== CONNECTION_NORMAL || connection_aborted()) {
                break;
            }

            $currentHash = $hasher->hash();

            // If hash has changed, tell the browser to reload.             if ($currentHash !== $appHash) {
                $appHash = $currentHash;

                $this->sendEvent('reload', ['time' => date('Y-m-d H:i:s')]);
                break;
            }
            if (mt_rand(1, 10) > 8) {
                $this->sendEvent('ping', ['time' => date('Y-m-d H:i:s')]);
            }

            sleep(1);
        }
    }

    /** * Send an event to the browser. */