Very Simple Object Cache Flusher through custom URL

very-simple-object-cache-flusher.php

<?php 
/**
* Plugin Name: Very Simple Object Cache Flusher
* Plugin URI: https://premium.wpmudev.org/
* Description: Flush object cache by calling custom URL with query var; 
*              Note: only works if Object Cache is integrated with WP via object-cache.php drop-in
* Author: adczk
* Author URI: https://premium.wpmudev.org/
* License: GPLv2 or later
*
* config explained in code comment; use as MU plugin
* use: just visit URL like "https://yoursite.com/?hocfe=12356 where 12356 should be replaced with key defined in the code
*/

// register query var
function hocfe_query_vars( $qvars ) {
	$qvars[] = 'hocfe';
	return $qvars;
}
add_filter( 'query_vars', 'hocfe_query_vars' );

// listen to request and run cache flush 
add_action( 'wp_footer', 'hocfe_flush_cache', 99 );
function hocfe_flush_cache() {
	
	$key = "12356"; // define key - can be any random string
	
	$doflush = get_query_var( 'hocfe', 0 );
	if ( $doflush == $key ) { 	
		$doneflush = wp_cache_flush();
		
		
	}

}