A file named App.php should be in the root directory of your app along with manifest.json.

When the user requests for anything in your app, Lobby interacts with this file to obtain what the user wants.

Class Naming

This file contains a class with the name of your app's ID. It is required that the class name should be the same as the App ID.

In case there's a - (minus) character in your App ID, then when naming the class, replace it to "_" (underscore). Because including - denotes subtraction and would cause a fatal PHP error.

Inside The Class

The class should be the child class of \Lobby\App and under the namespace Lobby\App. Here is a basic App.php file :

namespace Lobby\App;

class myAppID extends \Lobby\App {
  public function page($page){
    return "auto";

These are the conditions of a valid App class :

Handling Requests

When the user requests for a page of your app such as "//", Lobby will call the myAppID::page() function with parameter value ($page) as the page's path name.

Examples of parameter value :

URL Parameter Value
// "/create"
// "/weight/kilo"
// "/url"

The return value of myAppID::page() should be HTML code. If you want to return a PHP file as output, use myAppID::inc($path) as the return value. What this function does is execute the PHP file and return the processed output of the PHP file. Just like a normal PHP page.

If the myAppID::page() function returns "auto", then Lobby will look for the page file in "src/page" folder of your app's directory.

Examples of lookup in src/page :

URL Path Location in App Directory
// "/src/page/create"
// "/src/page/weight/kilo"
// "/src/page/url"

Here is a small example on how to respond with the requests got :

namespace Lobby\App;

class myAppID extends \Lobby\App {
    public function page($page){
        if( $page == "/" ){
            return "<h2>Requested the App's Index Page</h2>";
        }elseif ( $page == "/subinsiby" ){
            return $this->pageSubin();

    public function pageSubin(){
        return "<p>This is Subin's Page.</p>";

Here is an example of including an other file as output :

public function pageSubin(){
    return $this->inc("/src/inc/subin_page.php");


For easability, there are some constants for your app which can be used in App.php file :

Constant Value Example
$this->dir The absolute path to the App Directory. /var/www/lobby/contents/apps/ledit
APP_URL The App's URL. http://localhost/lobby/app/ledit
APP_SRC The App's Source URL. http://localhost/lobby/contents/apps/ledit