Fix #19108: Optimize `Component::hasEventHandlers()` and `Component::trigger()`

framework/CHANGELOG.md

@@ -35,6 +35,7 @@ Yii Framework 2 Change Log
 - Bug #19031: Fix displaying console help for parameters with declared types (WinterSilence)
 - Bug #19030: Add DI container usage to `yii\base\Widget::end()` (papppeter)
 - Bug #19096: Fix `Request::getIsConsoleRequest()` may return erroneously when testing a Web application in Codeception (WinterSilence)
+- Enh #19108: Optimize `Component::hasEventHandlers()` and `Component::trigger()` (WinterSilence)
 
 
 2.0.43 August 09, 2021

framework/base/Component.php

@@ -465,13 +465,17 @@ class Component extends BaseObject
     {
         $this->ensureBehaviors();
 
+        if (!empty($this->_events[$name])) {
+            return true;
+        }
+
         foreach ($this->_eventWildcards as $wildcard => $handlers) {
             if (!empty($handlers) && StringHelper::matchWildcard($wildcard, $name)) {
                 return true;
             }
         }
 
-        return !empty($this->_events[$name]) || Event::hasHandlers($this, $name);
+        return Event::hasHandlers($this, $name);
     }
 
     /**
@@ -594,10 +598,12 @@ class Component extends BaseObject
 
     /**
      * Triggers an event.
-     * This method represents the happening of an event. It invokes
-     * all attached handlers for the event including class-level handlers.
+     *
+     * This method represents the happening of an event. It invokes all attached handlers for the event
+     * including class-level handlers.
+     *
      * @param string $name the event name
-     * @param Event $event the event parameter. If not set, a default [[Event]] object will be created.
+     * @param Event|null $event the event instance. If not set, a default [[Event]] object will be created.
      */
     public function trigger($name, Event $event = null)
     {
@@ -606,15 +612,15 @@ class Component extends BaseObject
         $eventHandlers = [];
         foreach ($this->_eventWildcards as $wildcard => $handlers) {
             if (StringHelper::matchWildcard($wildcard, $name)) {
-                $eventHandlers = array_merge($eventHandlers, $handlers);
+                $eventHandlers[] = $handlers;
             }
         }
-
         if (!empty($this->_events[$name])) {
-            $eventHandlers = array_merge($eventHandlers, $this->_events[$name]);
+            $eventHandlers[] = $this->_events[$name];
         }
 
         if (!empty($eventHandlers)) {
+            $eventHandlers = call_user_func_array('array_merge', $eventHandlers);
             if ($event === null) {
                 $event = new Event();
             }