I'm trying to detect the current section of a site that a user is viewing by checking for the final directory in the URL. I'm using a PHP and regex to do it and I think I'm close but unfortunately not quite there yet.

Here's what I currently have:

<?php
    $url = $_SERVER['REQUEST_URI_PATH'] = preg_replace('/\\?.*/', '', $_SERVER['REQUEST_URI']);
    $one = '/one/';
    $two = '/three/';
    $three = '/three/';
    $four = '/four/';
    $five = '/five/';

    echo $url;

    if (substr($_SERVER['REQUEST_URI_PATH'], 0, strlen($one)) == $one) {
        // URI path starts with "/one/"
        echo "The section is one.";
    }
    elseif (substr($_SERVER['REQUEST_URI_PATH'], 0, strlen($two)) == $two) {
        // URI path starts with "/two/"
        echo "The section is two.";
    }
    elseif (substr($_SERVER['REQUEST_URI_PATH'], 0, strlen($three)) == $three) {
        // URI path starts with "/three/"
        echo "The section is three.";
    }
    elseif (substr($_SERVER['REQUEST_URI_PATH'], 0, strlen($four)) == $four) {
        // URI path starts with "/four/"
        echo "The section is four.";
    }
    elseif (substr($_SERVER['REQUEST_URI_PATH'], 0, strlen($five)) == $five) {
        // URI path starts with "/five/"
        echo "The section is five.";
    }
?>

I've placed in the echo before the if statements just to get confirmation of the value of $url. This outputs

/currentdirectory/file.php

However the conditions themselves don't match anything and my individual echo for each section never displays.

Also if there's a simpler way of doing it then I'm open to suggestions.

Thanks