WP Super Cache plugin to cache page depend on custom cookie value

cookie.php

<?
/*
# WP Super Cache plugin to cache pages with different custom cookie

This file must be in `wp-content/plugins/wp-super-cache-plugins` folder (depend on your choise at 1st step of this instruction)

To make it work, do the following:

1. Open `wp-content/wp-cache-config.php` and change `$wp_cache_plugins_dir` to this:

  `$wp_cache_plugins_dir = WP_CONTENT_DIR . "/plugins/wp-super-cache-plugins/";`

  In result, on Plugins page of WP Super Cache settings (/wp-admin/options-general.php?page=wpsupercache&tab=plugins) you will have only one plugin: this plugin, called `Cookie`

2. Use `mod_rewrite` way to cache your pages (WordPress Dashboard -> Advanced -> Caching -> Use `mod_rewrite` to serve cache files.), save options and update your `.htaccess` file with generated rules

3. Open `.htaccess` file and add cookie name in the end of each string that looks like this:

  `RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$`

  So you will have this:

  `RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_|YOUR_COOKIE_NAME).*$`

4. Change cookie name in `cache_my_page_with_set_cookie_action` function
  it's 2nd argument of `cache_my_page_with_set_cookie` function

If you omit one of this steps, nothing will work.

Developer documentation: https://odd.blog/wp-super-cache-developers/
 */
function cache_my_page_with_set_cookie_action($string) {
	// TODO: move this into plugin settings
	return cache_my_page_with_set_cookie($string, 'WEB_RUNR_CITY');
}

add_cacheaction('wp_cache_get_cookies_values', 'cache_my_page_with_set_cookie_action');
function cache_my_page_with_set_cookie($string, $cookie_name) {
	if (isset($_COOKIE[$cookie_name])) {
		$string = $cookie_name . $_COOKIE[$cookie_name];
	}
	return $string;
}

add_cacheaction('cache_admin_page', 'cache_my_page_with_set_cookie_admin_page');
function cache_my_page_with_set_cookie_admin_page() {
	?>
	<h4>Cookie</h4>
	<p><strong>Different cache snapshots for pages with different values of custom cookie.</strong></p>
	<p>You have to change this plugin and <code>.htaccess</code> to make it work and to change custom cookie name.</p>
	<p><em><strong>TODO:</strong> add input here to change cookie name and update <code>.htaccess</code> automatically.</em></p>
	<?
}