Organising my PHP scripts

[Mark Cunningham]

I have been using a structure for my PHP apps that has a central controller that all http requests go through.

<?php
include('db_fnc.php');
db_connection();
$controller="home";
$view=empty($_GET[view]) ? "index" : $_GET[view];
if($_POST[tutorial_submit])
    {
     insert_tutorial();
    }
switch($view)
    {
     case"index";
     $tutorials=db_select_all_rows(tutorials);
     $ar=array("introduction","instalation","first_script","html_php","variables");
     if(!isset($_GET[next_pos]) && !isset($_GET[previous_pos]))
         {
            $next_po_include="introduction";
        }
        elseif(isset($_GET[next_pos]))
        {
            $next_po_include=$_GET[next_pos];
        }
        elseif(isset($_GET[previous_pos]))
        {
            $next_po_include=$_GET[previous_pos];
        }
///////////LOOP THAT CREATES THE NEXT PREVIOUS LINKS///////////
     for($count=0;$ar[$count];$count++)
         {
            if($next_po_include==$ar[$count])
            {
                $next=$ar[($count+1)];
                $previous=$ar[$count-1];
            }
        }
     break;
     /////////////
     case"contact_us";
     $controller="contact_us";
     break;
     /////////////
     case"tutorial_feed";
     $controller="tutorial_feed";
     break;
     /////////////
     case"edit";
     $controller="edit";
     break;
     /////////////
     case"individual_tutorial";
     $tutorial=db_select_one_rows(tutorials);
     $controller="individual_tutorial";
     break;
     /////////////
     case"adding_tutorial";
     $controller="adding_tutorial";
     break;
     /////////////
     case"forum";
     $controller="forum";
     break;
     /////////////
     case"replies";
     $controller="replies";
     break;
     /////////////

    }


//include($_SERVER['DOCUMENT_ROOT']."/view/layouts/".$layout."/".$view.".php");
include($_SERVER['DOCUMENT_ROOT'].'/views/layouts/'.$controller.'.php');
?>

a bit messy but it allows for a strict directory structure for my files so I can separate my HTML from PHP.

Well my question is what structures are others using is there a better one like MVC which I think is a bit overkill but still an improvement.