A basic php example of routing without using any framework.
First of all you need to enable 'rewrite module' in Apache.
You can do this by configuring the httpd.conf file or through the GUI interface provided by WAMP server (Apache restart required).
You need to configure the site_url variable in config.php if you are using this project with different url other than http://localhost/route/
This php site can only use the first layer of the URI. e.g., http://localhost/route/about-us will work. But,
http://localhost/route/about-us/admin
or
http://localhost/route/var1/var2 won't work.
You need to store these /var1/var2 in form of arrays, where you'll first search $request0 and then $request1 in your site.