<?PHP

/**
 * struct
 * {
 *   unisgned char type;
 *   uint32_t time;
 *   uint32_t serid;
 *   uint32_t length;
 *   char body[0];
 * }
 */
function remoteCall(string $host, $port, string $data) {
    $length = strlen($data);
    $pack = pack('CNNNa*', 1, time(), 0, $length, $data);
    $client = new Swoole\Client(SWOOLE_SOCK_TCP);

    $client->set(array(
        'open_length_check' => true,
        'package_max_length' => 81920,
        'package_length_type' => 'N',
        'package_length_offset' => 9,
        'package_body_offset' => 13
    ));

    if (!$client->connect($host, $port, 0.5)) {
        return false;
    }
    
    $client->send($pack);
    $pack = $client->recv();
    $ret = unpack('Ctype/Ntime/Nserid/Nlength/a*data', $pack);
    
    return $ret['data'];
}

$ret = remoteCall("127.0.0.1", "5188", "sasa");


echo $ret;
?>