How to get the relative directory no matter from where it's included in PHP?

Question

If it\'s Path_To_DocumentRoot/a/b/c.php,should always be /a/b.

I use this:

dirname($_SERVER[\"PHP_SELF\"])

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Answer 1

PHP < 5.3:

dirname(__FILE__)

PHP >= 5.3:

__DIR__

EDIT:

Here is the code to get path of included file relative to the path of running php file:

    $thispath = explode('\\', str_replace('/','\\', dirname(__FILE__)));
    $rootpath = explode('\\', str_replace('/','\\', dirname($_SERVER["SCRIPT_FILENAME"])));
    $relpath = array();
    $dotted = 0;
    for ($i = 0; $i < count($rootpath); $i++) {
        if ($i >= count($thispath)) {
            $dotted++;
        }
        elseif ($thispath[$i] != $rootpath[$i]) {
            $relpath[] = $thispath[$i]; 
            $dotted++;
        }
    }
    print str_repeat('../', $dotted) . implode('/', array_merge($relpath, array_slice($thispath, count($rootpath))));