message: Use PHP socket again.
diff: @@ -56,6 +56,22 @@ function is_alpine_linux(): bool
  }
  function get_one_free_port()
  +{
  + $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
  + if (!socket_bind($socket, "0.0.0.0", 0)) {
  + return false;
  + }
  + if (!socket_listen($socket)) {
  + return false;
  + }
  + if (!socket_getsockname($socket, $addr, $port)) {
  + return false;
  + }
  + socket_close($socket);
  + return $port;
  +}
  +
  +function get_one_free_port_coro()
  {
  $socket = new Co\Socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
  $socket->bind('0.0.0.0');
  