WordPress function to delete add-on .webp files with their paired attachments

delete-webp-with-attachment.php

<?php 
/* 
Plugin Name: Delete webp files with image attachments
*/

/*
	Make sure to remove .webp files generated by EWWW or manually when their 
	parent .jpg image and thumbnails are deleted.
	
	This allows you to wipe the EWWW database table, which bloats quickly. If the db is wiped normally, deleting images will leave orphan .webp files.
	
	You can also make .webp files easily with the WebPonize app.
*/

function delete_webp_with_img( $attachmentid ) {
	// check if we have an image being deleted
	if(isset($attachmentid)) {
		// get the file path for the image being deleted
		$img = get_attached_file($attachmentid);
		// get the file path without the .jpg extension
		$img_root = preg_replace('/\.jp(e)?g|\.png|\.gif/', '', $img);
		// look for .webp files matching the path, including all thumbnails!
		$webp_files = glob($img_root . '*.webp');
		// do a foreach loop to delete each one
		foreach($webp_files as $webp_file) {
			if(file_exists($webp_file)) {
			wp_delete_file($webp_file);
			}
		}
	}
}
add_action( 'delete_attachment', 'delete_webp_with_img' );