php - Better way to handle relative paths -

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i inherited sites previous developer used spaghetti code below handle relative paths nav, image, , script items.

if(substr_count($_server['request_uri'], "/") <= 1){     define('nav', '');     define('img', 'i/');     define('inc', 'inc/'); }else{     $z = 0;     while($z < $i) {         $current_pos .= '../';         $z++;     }     define('nav', $current_pos);     define('img', $current_pos.'i/');     define('inc', $current_pos.'inc/'); }

used in markup this:

<a href="<? echo nav; ?>index.php"><img src="<? echo img; ?>spacer.gif" alt="home" /></a>

the site riddled these; making hard move. need better solution without having wade through pages make changes. using getcwd() it's not proving reliable. thanks!

often it's convenient use __file__ constant find location of current file , surrounding directories:

define('app_path', dirname(__file__) . "/"); $img = app_path . "img/"; $js = app_path . "js/"; // etc  // includes... require_once(app_path . "include/file.php"); require_once(app_path . "../upperleveldir/file2.php");

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