How to solve the problem that the file creation time (filectime) does not change after PHP deletes the file and rebuilds it? ?

1. php creates a file named test.html and uses filectime to get the creation time t1

2. php deletes the file named test.html

3. php recreates the file named test.html and uses filectime to get the creation time t2

Why t1 = t2? ? Why is the creation time not updated? ? I used the clearstatcache function to clear the file status cache, but it didn't work. How to solve this problem? ? (Because when judging whether to regenerate the cache file, you need to know the creation time of the cache file, so it is very important..., please solve it~)
The following is the code for the problem that occurs in this situation (it is a bit dense, please be patient and read it) ):

<code>     // 页面缓存
     if ((defined('DEBUG_MODE') && !DEBUG_MODE) && (defined('CACHE_CONTROL') && CACHE_CONTROL)) {
         $opr = $GLOBALS['module'] . '/' . $GLOBALS['platform'] . '/' . $GLOBALS['controller'] . '/' . $GLOBALS['act'];
         $cache_name = md5($opr) . TEMPLATE_SUFFIX;
         $cache_file = APP_DIR . '/' . $GLOBALS['module'] . '/' . $GLOBALS['platform'] . '/Cache/' . $cache_name;
         // 清除文件状态缓存（就我使用的情况来看，压根没毛用...，这什么情况？？）
         clearstatcache();
         // 缓存文件不存在 创建
         if (!$GLOBALS['FOpr']->checkFile($cache_file)) {
            require_once $view_file;
            $GLOBALS['FOpr']->cFile($cache_file);
            $GLOBALS['FOpr']->wData($cache_file , ob_get_contents());
         } else {
            // 超时重新缓存
            if (time() > filectime($cache_file) + CACHE_LIFE_TIME) {
                require_once $view_file;
                // 缓存文件超时时，先删除原缓存文件
                $GLOBALS['FOpr']->dFile($cache_file);
                // 新建同名缓存文件
                //（新建文件时，filectime 获取文件创建时间一直没更新！这个怎么破？？
                // 这导致我没法重新生成缓存文件了！）
                $GLOBALS['FOpr']->cFile($cache_file); 
                // 写入缓存
                $GLOBALS['FOpr']->wData($cache_file , ob_get_contents() , 'w');
            } else {
                // 加载缓存文件
                require_once $cache_file;
            }
         }
     } else {
         // 显示动态文件（非缓存）
         require_once $view_file;
     }</code>