Are there any examples of plugins using onFileAfterDelete effectively

The `onFileAfterDelete` event is triggered after a file has been deleted from the system. Here is an example of how you can use this event in a custom Joomla plugin[3]:

php
<?php
defined('_JEXEC') or die;

class PlgFileExample extends JPlugin
{
    /**
     * Triggered after a file has been deleted
     *
     * @param   string  $context  The context of the file deletion
     * @param   object  $table    The table from which the file was deleted
     *
     * @return  void
     */
    public function onFileAfterDelete($context, $table)
    {
        // Check the context to ensure this is the correct event
        if ($context === 'com_media.file')
        {
            // Perform actions after the file has been deleted
            $this->logFileDelete($table);
        }
    }

    /**
     * Logs the deletion of a file
     *
     * @param   object  $table  The table from which the file was deleted
     *
     * @return  void
     */
    protected function logFileDelete($table)
    {
        $app = JFactory::getApplication();
        $app->enqueueMessage('File deleted: ' . $table->name, 'info');
    }
}
?>

In this example, the `onFileAfterDelete` method is defined in a plugin class called `PlgFileExample`. The method checks the context to ensure it's the correct event (`'com_media.file'`), and then logs a message about the deleted file using the Joomla application object.

To use this plugin, you would need to create a new folder in your Joomla installation's `plugins/` directory called `file` and place the `PlgFileExample.php` file inside it. You would also need to create an XML manifest file to describe the plugin and enable it in the Joomla plugin manager.

This example demonstrates how you can use the `onFileAfterDelete` event to perform custom actions after a file has been deleted, such as logging the deletion or updating a database.