Swoole

$serv = new swoole_server("127.0.0.1", 9501);
$serv->on('connect', function ($serv, $fd){
 	echo "Client:Connect.\n";
});
$serv->on('receive', function ($serv, $fd, $from_id, $data) {
	$serv->send($fd, 'Swoole: '.$data);
    $serv->close($fd);
});
$serv->on('close', function ($serv, $fd) {
 	echo "Client: Close.\n";
});
$serv->start();

$client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);

$client->on("connect", function($cli) {
    $cli->send("hello world\n");
});

$client->on("receive", function($cli){
    $data = $cli->recv();
    echo "Receive: $data\n";
});

$client->on("error", function($cli){
    echo "connect fail\n";
});

$client->on("close", function($cli){
    echo "close\n";
    $cli->close();
});

$client->connect('127.0.0.1', 9501, 0.5);

$fp = stream_socket_client("tcp://127.0.0.1:9501", $errno, $errstr, 30);
if (!$fp) {
    exit("$errstr ($errno)\n");
}
fwrite($fp, "HELLO world");
swoole_event_add($fp, function($fp){
	echo fgets($fp, 1024);
	swoole_event_del($fp);
    fclose($fp);
});

cd swoole/
phpize
./configure
make && make install

cd swoole/
cmake .
make && make install