basic_controller.php

<?php
/* on config.php you put your initialization stuff, like session start and bd connection */
require_once("includes/config.php");

$uri = $_SERVER['REQUEST_URI'];
/* default is index */
$pagina = "index";

if($uri != "/")
{
	/* url parsing */

        /* remove url parameters */
	$t = explode('?',$uri);
        /* divide request */
        $path = explode("/",$t[0]);

	$module = strtolower($path[1]);
	/* an extra check if there's a dir with this name */
	if(!is_dir($module))
	{
		/*verifies if there's a module with this name*/
		if(is_dir("modules/$module"))
			$pagina = $module."/index";
		else if(is_file("modules/$module.php"))
			$pagina = $module;
		else
			/* if doesn't, get the 'not found' module */
			$pagina = "404";

	}
}

require_once("modules/$pagina.php");