<?php

$galleries_base_dir = "/path/to/galleries";
$default_gallery = "default_gallery";
$pages_base_dir = "/path/to/pages";
$default_page = "home";

if(isset($_GET['page'])) {
    $page = $_GET['page'];
} else {
    $page = $default_page;
}

if(isset($_GET['gallery'])) {
    $gallery = $_GET['gallery'];
} else {
    $gallery = $default_gallery;
}

include("header.php");

switch($page) {
    case "gallery":
        $gallery_path = "{$galleries_base_dir}/{$gallery}.php";
        include(get_page_to_load($gallery_path, "{$galleries_base_dir}/{$default_gallery}.php");
    break;
    default:
        $page_path = "{$pages_base_dir}/{$page}.php";
        include(get_page_to_load($page_path, "{$pages_base_dir}/{$default_page}.php"));
    break;
}


include("footer.php");

function get_page_to_load($attempted_page, $default_page) {
    if(file_exists($attempted_page)) {
        return $attempted_page;
    } else {
        return $default_page;
    }
}

?>