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4.x is outdated, please check the latest version 22.x
Latest version:
pecl install openswoole-22.1.2
<?php Swoole\WebSocket\Server->on('Start', callable $callback)
The event name to set a callback for
Callable function for the server event type
If success, it returns true, otherwise it returns false
This function is executed when the WebSocket server starts, this causes the event loop to trigger the Start event. You may perform startup tasks within this callback but do not perform any blocking operations at this stage.
<?php
use Swoole\WebSocket\Server;
use Swoole\Http\Request;
use Swoole\WebSocket\Frame;
$server = new Server("127.0.0.1", 9501);
$server->on("Start", function(Server $server)
{
echo "Swoole WebSocket Server started at 127.0.0.1:9501\n";
});
$server->on('Open', function(Server $server, Swoole\Http\Request $request)
{
echo "connection open: {$request->fd}\n";
$server->tick(1000, function() use ($server, $request)
{
$server->push($request->fd, json_encode(["hello", time()]));
});
});
$server->on('Message', function(Server $server, Frame $frame)
{
echo "received message: {$frame->data}\n";
$server->push($frame->fd, json_encode(["hello", time()]));
});
$server->on('Close', function(Server $server, int $fd)
{
echo "connection close: {$fd}\n";
});
$server->start();