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modules/newsletterpro/classes/Event.php

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+<?php
+/**
+ * Since 2013 Ovidiu Cimpean.
+ *
+ * Ovidiu Cimpean - Newsletter Pro © All rights reserved.
+ *
+ * DISCLAIMER
+ *
+ * Do not edit, modify or copy this file.
+ * If you wish to customize it, contact us at addons4prestashop@gmail.com.
+ *
+ * @author    Ovidiu Cimpean <addons4prestashop@gmail.com>
+ * @copyright Since 2013 Ovidiu Cimpean
+ * @license   Do not edit, modify or copy this file
+ *
+ * @version   Release: 4
+ */
+
+namespace PQNP;
+
+class Event
+{
+    protected static $events = [];
+
+    public static function listen($event_name, callable $callback)
+    {
+        if (!isset(self::$events[$event_name])) {
+            self::$events[$event_name] = [];
+        }
+
+        self::$events[$event_name][] = $callback;
+    }
+
+    public static function detach($event_name)
+    {
+        if (array_key_exists($event_name, self::$events)) {
+            unset(self::$events[$event_name]);
+        }
+    }
+
+    public static function notify($event_name, $data)
+    {
+        if (array_key_exists($event_name, self::$events)) {
+            foreach (self::$events[$event_name] as $callback) {
+                call_user_func_array($callback, [$data]);
+            }
+        }
+    }
+}