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<?php |
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namespace Shetabit\Multipay; |
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class EventEmitter |
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{ |
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/** |
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* List of listeners. |
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* |
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* @description a pair of $event => [array of listeners] |
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* |
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* @var array |
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*/ |
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private $listeners = []; |
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/** |
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* Add new listener fo given event. |
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* |
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* @param string $event |
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* @param callable $listener |
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* |
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* @return void |
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*/ |
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public function addEventListener(string $event, callable $listener) |
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{ |
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if (empty($this->listeners[$event]) || !is_array($this->listeners[$event])) { |
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$this->listeners[$event] = []; |
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} |
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array_push($this->listeners[$event], $listener); |
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} |
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/** |
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* Remove given listener from a specefic event. |
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* if we call this method without listener, it will totaly remove the given event and all of its listeners. |
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* |
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* @param string $event |
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* @param callable $listener |
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* |
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* @return void |
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*/ |
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public function removeEventListener(string $event, callable $listener = null) |
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{ |
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if (empty($this->listeners[$event])) { |
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return; |
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} |
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// remove the event and all of its listeners |
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if (empty($listener)) { |
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unset($this->listeners[$event]); |
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return; |
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} |
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// remove only the given listener if exists |
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$listenerIndex = array_search($listener, $this->listeners[$event]); |
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if ($listenerIndex !== false) { |
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unset($this->listeners[$event][$listenerIndex]); |
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} |
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} |
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/** |
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* Run event listeners. |
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* |
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* @param string $event |
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* @param array ...$arguments |
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* |
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* @return void |
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*/ |
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public function dispatch(string $event, ...$arguments) |
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{ |
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$listeners = $this->listeners; |
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if (empty($listeners[$event])) { |
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return; |
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} |
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array_walk($listeners[$event], function ($listener) use ($arguments) { |
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call_user_func_array($listener, $arguments); |
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}); |
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} |
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/** |
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* Call events by their name. |
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* |
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* @param string $name |
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* @param array $arguments |
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* |
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* @return void |
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*/ |
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public function __call($name, $arguments) |
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{ |
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$this->dispatch($name, $arguments); |
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} |
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} |
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shetabit /
multipay
