PHP event listener simple example

php-event-listener-example.php

<?php
// Used in https://github.com/im4aLL/roolith-event

class Event {
    private static $events = [];

    public static function listen($name, $callback) {
        self::$events[$name][] = $callback;
    }

    public static function trigger($name, $argument = null) {
        foreach (self::$events[$name] as $event => $callback) {
            if($argument && is_array($argument)) {
                call_user_func_array($callback, $argument);
            }
            elseif ($argument && !is_array($argument)) {
                call_user_func($callback, $argument);
            }
            else {
                call_user_func($callback);
            }
        }
    }
}

class User {
    public function login() {
        return true;
    }

    public function logout() {
        return true;
    }

    public function updated() {
        return true;
    }
}

// Usage
// ==================================

Event::listen('login', function(){
    echo 'Event user login fired! <br>';
});

$user = new User();

if($user->login()) {
    Event::trigger('login');
}

// Usage with param
// ==================================

Event::listen('logout', function($param){
    echo 'Event '. $param .' logout fired! <br>';
});

if($user->logout()) {
    Event::trigger('logout', 'user');
}


// Usage with param as array
// ==================================

Event::listen('updated', function($param1, $param2){
    echo 'Event ('. $param1 .', '. $param2 .') updated fired! <br>';
});

if($user->updated()) {
    Event::trigger('updated', ['param1', 'param2']);
}

Great code!
👍

I made some changes to your code and added the support to parameters.

If you are interested:
https://gist.github.com/nicolasegp/0c6707774b5d8bb8a0edb7426d512d3d

Cool! Thanks a lot!

@shadowng Thanks buddy! @AntoninaSych thanks!

good

good example

very useful example

@nicolasegp because of the username change, link is changing too:
https://gist.github.com/nicolasegp/0c6707774b5d8bb8a0edb7426d512d3d

@Synida thx I already edited the link 👍

Working on parsing my files to document events. Regex below, taking suggestions on anything missing or alternative regexes thanks.

Gist

preg_match('/Event::trigger\(((\'|\").*)(,|\',) \[(.*)]\)/', $line, $matches);

Package published https://github.com/im4aLL/roolith-event if anyone wants to use it.

it doesn't want to pass an array to parameters , why ?

@fdciabdul which parameter you are talking about?

@fdciabdul which parameter you are talking about?

i mean like this

Event::listen('logout', function($param){
    echo 'Event '. $param .' logout fired! <br>';
});

if($user->logout()) {
$data = array("first","second","third");


    Event::trigger('logout', $data);
}

the output is just first , not return the array itself

@fdciabdul you can call multiple params function($param1, $param2, $param3) or if you want the whole array then just call it like this -

Event::trigger('logout', [$data]);