clean-media.php

<?php
/*
 *     Plugin Name: Clean media files in trash
 *
 *     Plugin URI: https://fullworks.net/products/the-webinar-toolkit/
 *     Description: add define('EMPTY_MEDIA_TRASH_DAYS', 7);  to wp-config.php
 *     Version: 1.0
 *     Author: Fullworks
 *     Author URI: https://fullworks.net/
 *     Licence:  GPL 2 or later
 *    
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

/*
* set up an daily cron job
*
* ideally would also remove the scheduled event on plugin deactivation / uninstall - 
*  but it isn't that critical just will try and run and fail once the next day after deactivation
*  see https://developer.wordpress.org/reference/functions/register_deactivation_hook/  and
*  https://developer.wordpress.org/reference/functions/register_uninstall_hook/
*  
*/

if ( ! wp_next_scheduled( 'myown_image_clean' ) ) {
	wp_schedule_event( time(), 'daily', 'myown_image_clean' );
}

/*
* cleaning
*/
add_action(
	'myown_image_clean',
	function () {
		if ( ! defined( 'EMPTY_MEDIA_TRASH_DAYS' ) ) {
	            return;   // do nothing if not defined
                 }

		$args        = array(
			'post_type'      => 'attachment',
			'posts_per_page' => - 1,
			'post_status'    => 'trash',
			'date_query'     => array(
				array(
					'before' => '-' . EMPTY_MEDIA_TRASH_DAYS .' days',
				),
			),
		);
		$attachments = get_posts( $args );
		foreach ( $attachments as $attachment ) {
			wp_delete_attachment( $attachment->ID, true );
		}
	}
);