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run code in 150+ php & hhvm versions
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<?php class Mediator { var $events = array(); function attach($eventName, $callback) { $this->events[$eventName][] = $callback; } function trigger($eventName, $data = null) { foreach ($this->events[$eventName] as $callback) { $callback($eventName, $data); } } } ?>
Output for 4.3.0 - 4.4.9, 5.1.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Output for 5.0.0 - 5.1.2
Strict Standards: var: Deprecated. Please use the public/private/protected modifiers in /in/5Eab6 on line 4