Extracting a directory from a URL

[mactoph]

I am working with this structure of URL:

http://www.domain.com/Dir1/Dir2/Dir3/Dir4/index.php

and am trying to extract Dir4 into a variable, i.e. $directory=Dir4

I've used this:
$url = getenv("REQUEST_URI");
$root = dirname($url);

to get

$root = Dir1/Dir2/Dir3/Dir4

but am not sure how to pull out that last directory. Any suggestions?

Thanks

[njm]

$arr = explode('/',$root);

to get an array of each directory.

hth, njm

[mactoph]

Thanks much njm!