A wildcard event handler that logs all Yii/Craft events

EventCatcher.php

class EventCatcher
{

    /**
     * @var array 
     */
    protected $classConstants = [];

    public function __invoke(yii\base\Event $event)
    {
        $triggerClass = get_class($event->sender);
        $eventClass   = get_class($event);
        $name         = $this->getEventConstantName($triggerClass, $event->name);
        \Craft::warning("$triggerClass::$name using ($eventClass)", 'event');
    }

    protected function getEventConstantName(string $class, string $name): string
    {

        if (!isset($this->classConstants[$class])) {
            $info                         = new ReflectionClass($class);
            $this->classConstants[$class] = $info->getConstants();
        }

        foreach ($this->classConstants[$class] as $k => $v) {
            if ($v === $name) {
                return $k;
            }
        }

        return $name;
    }
}

register it in your config/app.php like this:

    'bootstrap' => [
        function () {
            Event::on('*', '*', new EventCatcher());
        }
    ]

and you get this in your logs:

2018-09-27 16:41:20 [-][1][-][warning][event] craft\db\Query::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] nystudio107\seomatic\services\Sitemaps::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] nystudio107\seomatic\services\FrontendTemplates::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] nystudio107\seomatic\services\MetaBundles::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\db\Query::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\services\Plugins::EVENT_AFTER_LOAD_PLUGINS using (yii\base\Event)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\elements\db\UserQuery::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\db\Query::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\db\Query::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\elements\db\UserQuery::EVENT_BEFORE_PREPARE using (craft\events\CancelableEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\db\Query::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\PlainText::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Matrix::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Color::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Categories::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\redactor\Field::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Assets::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Tags::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Matrix::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\PlainText::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\PlainText::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Table::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\PlainText::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Assets::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Assets::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Lightswitch::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\PlainText::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Assets::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\redactor\Field::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\PlainText::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Matrix::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Assets::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\fields\Entries::EVENT_DEFINE_BEHAVIORS using (craft\events\DefineBehaviorsEvent)


...

2018-09-27 16:41:20 [-][1][-][warning][event] craft\web\Application::EVENT_AFTER_REQUEST using (yii\base\Event)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\web\Response::EVENT_BEFORE_SEND using (yii\base\Event)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\web\Response::EVENT_AFTER_PREPARE using (yii\base\Event)
2018-09-27 16:41:20 [-][1][-][warning][event] craft\web\Response::EVENT_AFTER_SEND using (yii\base\Event)

btw, this is a good example how to register a event handler class instead of a closure.

This is fantastic Oliver, and great use of the __invoke() method!!