extension=swoole.so

<?php
$serv = new swoole_server("0.0.0.0", 9501);
$serv->on('connect', function ($serv, $fd, $reactor_id){
    echo "[#".posix_getpid()."]\tClient@[$fd:$reactor_id]: Connect.\n";
});
$serv->set(array(
    'worker_num' => 1,

));

$serv->on('receive', function (swoole_server $serv, $fd, $reactor_id, $data) {
    echo "[#".$serv->worker_id."]\tClient[$fd] client data: $data\n";
    if ($serv->send($fd, "Server {$data}\n") == false)
    {
        echo "error\n";
    }

});

$serv->on('close', function ($serv, $fd, $reactor_id) {
    echo "[#".posix_getpid()."]\tClient@[$fd:$reactor_id]: Close.\n";
});

$serv->start();

php echo.php

telnet 127.0.0.1 9501