What's the best way to get the Directory of a URL using php?

[Udathggek]

Im trying to set active classes in a nav using php. Now I need to set it by directory rather than complete URL as I have a main landing page for each directory with sub navigation for the other pages within the directory. I was going to use the following but this returns the full url.\[code\]function curPageURL() {$pageURL = 'http'; if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}$pageURL .= "://"; if ($_SERVER["SERVER_PORT"] != "80") {$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];} else {$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];}return $pageURL;} function activeLink($pageID) {if ( $pageID == curPageURL() ) { echo 'class="active"';} }\[/code\]Then I call activeLink() in a nav item like this:\[code\]<li class="projectchild padding1"><a href="http://www.strangeleaves.com/nexus/index.php" <?php activelink('http://www.strangeleaves.com/nexus/index.php'); ?> >nexus</a></li>\[/code\]Your suggestions on how to modify this to return the directory instead would be much appreciated.