create multiple servers with php swoole

create multiple servers with php swoole.php

<?php
/*
open two udp servers and two tcp servers simultaneously with swoole

to test them from linux shell:
$nc -u 127.0.0.1 21404
helloooo_udp
helloooo_udp
...

$nc -u 127.0.0.1 21405
helliiiii_udp
helliiiii_udp
...

$nc 127.0.0.1 21406
hellaaaaa_tcp
hellaaaaa_tcp
...

$nc 127.0.0.1 21407
helleeeee_tcp
helleeeee_tcp
...
*/

$udp_server=new swoole_server('0.0.0.0', 21404, SWOOLE_BASE, SWOOLE_UDP);
$udp_server->on('packet', function ($ipsock, $data, $ipsock_con)
                          {
                              $ipsock->sendto($ipsock_con['address'], $ipsock_con['port'], 'helloooo_udp', $ipsock_con['server_socket']);
                          }
               );
$udp_server1=$udp_server->listen('0.0.0.0', 21405, SWOOLE_UDP);
$udp_server1->on('packet', function ($ipsock, $data, $ipsock_con)
                          {
                              $ipsock->sendto($ipsock_con['address'], $ipsock_con['port'], 'helliiiii_udp', $ipsock_con['server_socket']);
                          }
               );
$tcp_server=$udp_server->listen('0.0.0.0', 21406, SWOOLE_TCP);
$tcp_server->on('receive', function ($server, $fd, $reactor_id, $data)
                           {
                            $server->send($fd, 'hellaaaaa_tcp');
                           }
               );
$tcp_server1=$udp_server->listen('0.0.0.0', 21407, SWOOLE_TCP);
$tcp_server1->on('receive', function ($server, $fd, $reactor_id, $data)
                           {
                            $server->send($fd, 'helleeeee_tcp');
                           }
               );
$udp_server->start();