Amp\Artax\SocketPool::dequeueNextWaitingSocket PHP Method

    private function dequeueNextWaitingSocket($uri)
    {
        $queueStruct = current($this->queuedSocketRequests[$uri]);
        list($promisor, $uri, $options) = $queueStruct;
        if ($socket = $this->checkoutExistingSocket($uri, $options)) {
            array_shift($this->queuedSocketRequests[$uri]);
            $promisor->succeed($socket);
            return;
        }
        if ($this->allowsNewConnection($uri, $options)) {
            array_shift($this->queuedSocketRequests[$uri]);
            $this->initializeNewConnection($promisor, $uri, $options);
        }
    }