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<?php |
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|
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namespace ImportWP\Common\Importer; |
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|
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class EventHandler |
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{ |
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/** |
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* Single instance of class |
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*/ |
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protected static $_instance = null; |
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/** |
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* List of stored events |
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* |
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* @var array $events |
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*/ |
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private $events; |
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|
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public static function instance() |
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{ |
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if (is_null(self::$_instance)) { |
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self::$_instance = new self(); |
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} |
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|
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return self::$_instance; |
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} |
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|
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/** |
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* Trigger event |
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* |
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* @param string $event |
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* @param array $args |
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* |
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* @return void |
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*/ |
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public function run($event, $args = array()) |
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{ |
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|
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if (isset($this->events[$event]) && is_array($this->events[$event]) && !empty($this->events[$event])) { |
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foreach ($this->events[$event] as $callback) { |
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|
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call_user_func_array($callback, (array) $args); |
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} |
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} |
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} |
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|
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/** |
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* Add event |
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* |
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* @param string $event |
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* @param $callback |
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*/ |
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public function listen($event, $callback) |
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{ |
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|
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if (!isset($this->events[$event])) { |
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$this->events[$event] = array(); |
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} |
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|
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$this->events[$event][] = $callback; |
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} |
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|
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/** |
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* Remove event |
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* |
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* @param string $event |
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* @param $callback |
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*/ |
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public function unlisten($event, $callback) |
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{ |
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if (isset($this->events[$event]) && in_array($callback, $this->events[$event], true)) { |
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|
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if (($key = array_search($callback, $this->events[$event])) !== false) { |
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unset($this->events[$event][$key]); |
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} |
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|
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if (empty($this->events[$event])) { |
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unset($this->events[$event]); |
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} |
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} |
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} |
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} |
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|
