Magento 2 events catcher

<?php
/**
 * Created by PhpStorm.
 * User: Giel
 * Date: 18/04/16
 * Time: 22:15
 */

namespace Gielberkers\Example\Plugin\Magento\Framework\Event;

class Manager
{
    private $events;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->events = [];
    }

    /**
     * Destructor
     */
    public function __destruct()
    {
        $data = '';

        foreach ($this->events as $event) {
            $data .= sprintf('
<event>
    <name>%1$s</name>
    <file>%4$s</file>
    <class>%2$s</class>
    <function>%3$s</function>
</event>',
                $event['name'],
                $event['class'],
                $event['function'],
                $event['file']
            );
        }

        $output = new \SimpleXMLElement('<events>' . $data . '</events>');
        $output->asXML('/var/www/events.xml');
    }

    /**
     * @param \Magento\Framework\Event\Manager $manager
     * @param string $event
     * @param array $data
     */
    public function beforeDispatch(
        \Magento\Framework\Event\Manager $manager, string $eventName, array $data
    )
    {
        $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);

        $found = false;

        foreach ($backtrace as $idx => $bt) {
            if (!$found) {
                if ($bt['function'] === 'dispatch') {
                    $found = true;
                }
            } else {
                if ($bt['function'] !== 'dispatch') {
                    // Gotcha:
                    $this->events[] = [
                        'name' => $eventName,
                        'file' => isset($backtrace[$idx]['file']) ? $backtrace[$idx]['file'] . ':' . $backtrace[$idx]['line'] : '',
                        'function' => $backtrace[$idx]['function'],
                        'class' => isset($backtrace[$idx]['class']) ? $backtrace[$idx]['class'] : ''
                    ];
                    break;
                }
            }
        }
    }
}