Nginx Cache Controller ver.1.1.2+ で、標準以外の URL キャッシュを削除する方法

nginxchampuru_get_cache.php

<?php
add_filter('nginxchampuru_get_cache', 'nginxchampuru_get_cache', 10, 2);
function nginxchampuru_get_cache($key, $url = null) {
    global $nginxchampuru;
    if (!$url) {
        $url = $nginxchampuru->get_the_url();
    }
    $keys = array(
        $key,
        $nginxchampuru->get_cache_key($url.'@ktai'),
        $nginxchampuru->get_cache_key($url.'@smartphone'),
        $nginxchampuru->get_cache_key($url.'@smartphone.off'),
    );
    if ($key !== $nginxchampuru->get_cache_key($url)) {
        $keys[] = $nginxchampuru->get_cache_key($url);
    }
    return $nginxchampuru->get_cache_file($keys);
}