Include pages specified in the URL?

Now, I include body.php into main.php by putting the following code into index.php:

<?php include ("body.php"); ?>

PHP:

My problem is, how to include pages specified in the URL? For example, when I visit:

index.php?dir=products, it will include products.php, when I visit
index.php?dir=db/core, it will include core.php, which is put in the folder "db".

And if nothing is specified in the URL, it will include home.php. How can I do that? Helping will be appreciated!

 

This should work

<?php
if (isset($_GET['dir']) && $_GET['dir'] != "") {
$dir = $_GET['dir'];
if (file_exists(''.$dir.'.php')) {
@include (''.$dir.'.php');
} elseif (!file_exists(''.$dir.'.php')) {
echo 'Page not found!';
}
} else {
@include ('home.php');
}
?>

Code (markup):

For the db/core thing to work, you'd probably have to assign another variable, something like "?dir=db&page=core". The script above will only check if products.php exists in the same folder, once a url like "?dir=products" is passed to it. You could maybe make a regex (regular expression) to find before and after the / in db/core with the folder & page name.

 

Or, an extremely simplified version of the above:

if(isset($_GET['dir'])) {
$dir = $_GET['dir'];
include("$dir.php");
}

Code (markup):

 

This way is much more vulnerable to attacks, especially if allow_url_fopen is enabled in PHP

 

Thanks for helping!