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PHP event listener simple example
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<?php | |
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']); | |
} |
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