$loop = React\EventLoop\Factory::create();

$loop->addPeriodicTimer(1, function () use ($loop) {
    $connector = new \React\Socket\Connector($loop, array(
        'timeout' => 0.5,
        'dns' => false,
        'tls' => false,
        'unix' => false,
    ));

    // Use host and port combination that results in connection being timed out.
    $connector->connect('89.123.45.67:3128')
        ->then(function (\React\Socket\ConnectionInterface $stream) {
            $stream->close();
            printf("[+] %.3fMB\n", memory_get_usage() / 1024 / 1024);
        })->otherwise(function (\Exception $e) {
            printf("[-] %.3fMB (%s)\n", memory_get_usage() / 1024 / 1024, $e->getMessage());
        });
});

$loop->addTimer(60, function () use ($loop) {
    printf(
        "%.3fMB => %d => %.3fMB\n",
        memory_get_usage() / 1024 / 1024,
        gc_collect_cycles(),
        memory_get_usage() / 1024 / 1024);
    $loop->stop();
});

$loop->run();