What does swoole on mean?

Server->on

Register the event callback function of Server.                                                                                                                                                                                                                                   (Recommended learning: swoole video tutorial)

bool Server->on(string $event, mixed $callback);

The first parameter is the name of the callback, which is not case-sensitive. For specific content, please refer to the callback function list. The event name string is not required The second function added on

is the callback PHP function, which can be a string of function names, class static methods, object method arrays, and anonymous functions.

When the on method is called repeatedly, the last setting will be overwritten

$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, $reactor_id, $data) {
    $serv->send($fd, 'Swoole: '.$data);
    $serv->close($fd);
});
$serv->on('close', function ($serv, $fd) {
    echo "Client: Close.\n";
});
$serv->start();

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