Loguear todos los eventos de ZF2 al error_log

Module.php

<?php
class Module {
 //...
 
    public function onBootstrap(EventInterface $e)
    {
        //...
        
        $eventManager        = $e->getApplication()->getEventManager();
        $sharedEventManager = $eventManager->getSharedManager();
        $sharedEventManager->attach('*',
                '*',
                function ($e)
                {
                    $event = $e->getName();
                    $target = get_class($e->getTarget());
                    $params = $e->getParams();
                     $output = sprintf(
                             'Event "%s" was triggered on target "%s", with parameters %s',
                             $event,
                             $target,
                             json_encode($params));
                    
                    error_log($output);
                    
                    // Return true so this listener doesn't break the validator
                    // chain triggering session.validate listeners
                    return true;
                });
    }
}