PHP：如何获取当前URL的目录深度？

Question

I'm working on the 404 page for my company's site, and it has a $depth variable that says "../site/". This works fine for any bad urls in the base directory, but anything in a subfolder is grabbing the css files from the wrong place using the $depth variable. I tried $depth = '/site/' and it grabbed no css files at all. My question is, how can I have PHP figure out the $depth dynamically, specifically, the number of ../ to put in? If I can get a number or something, this is easy, but I can't seem to find a quick, easy way to do this.

Edit: Turns out, the 404.php file is only in one location, regardless of which directory the bad url is referencing. So, my real problem is probably not php-related at all. Why would a 404 page get a css file in one folder when reached from www.siteurl.com/404 but get a css file of the same name from a different folder when reached from www.siteurl.com/foo/bar?

Answer 1

Here's a function I wrote a few years ago, I use it on my website. It should help:

<?
function absolute_include($file)
         {
         /*
         $file is the file url relative to the root of your site.
         Yourdomain.com/folder/file.inc would be passed as
         "folder/file.inc"
         */

         $folder_depth = substr_count($_SERVER["PHP_SELF"] , "/");

         if($folder_depth == false)
            $folder_depth = 1;

         include(str_repeat("../", $folder_depth - 1) . $file);
         }
?>