聊天服务器测试的问题

$socket_client = stream_socket_client('192.168.31.103:7272', $errno, $errstr);
stream_set_blocking($socket_client, 0);
if (!$socket_client) {
    die("$errstr ($errno)");
} else {
    $package_data = array('a'=> 'b',);
    $package = json_encode($package_data);
    $res = fwrite($socket_client, $package);
    usleep(100000);
    debug(fread($socket_client, 1000000));
        fclose($socket_client);
}