Сокет на PHP. Простой пример

Простой пример, который просто слушает и отвечает Hi! its work! при обращении

    <?php
    $socket = stream_socket_server("tcp://0.0.0.0:8000", $errorNumber, $errorDescription);
    if (!$socket) {
        die("$errorDescription ($errorNumber)\n");
    }
    while ($connect = stream_socket_accept($socket, -1)) {
        fwrite($connect, "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: close\r\n\r\nHi! its work!\n\n");
        fclose($connect);
    }
    fclose($socket);