processMessages example

        P\Utils::queue()->run();

        if ($this->active && \curl_multi_select($this->_mh, $this->selectTimeout) === -1) {
            // Perform a usleep if a select returns -1.             // See: https://bugs.php.net/bug.php?id=61141             \usleep(250);
        }

        while (\curl_multi_exec($this->_mh, $this->active) === \CURLM_CALL_MULTI_PERFORM) {
        }

        $this->processMessages();
    }

    /** * Runs until all outstanding connections have completed. */
    public function execute(): void
    {
        $queue = P\Utils::queue();

        while ($this->handles || !$queue->isEmpty()) {
            // If there are no transfers, then sleep for the next delay