So that our hello world app will actually print hello world, you'll need to edit the index handler for the application.

All action handlers will be created under the following directory:

/path/to/server/htdocs/applications/$APP_KEY

In this tutorial, the handler file will be:

/path/to/server/htdocs/applications/app_hello/app_index.php

Open the file in your favorite IDE ( E29 strongly recommends Eclipse ). You'll find the stub handler that we created on the last page:

<?php
class App implements serenity_application
{
 
	public function App()
	{	
 	 	//
                // Go for it
	}
}
?>

This is the very basic structure of every action handler in Serenity AP. For a very simple approach, enter the following directly under the Go for it comment:

print "Hello world!";

Save and visit http://your_web_host/ to view the results:

Hello World!

Not very exciting, but a good way to get your feet wet with the system. Continue to the next section to work with sGen, Serenity's powerful and fast style engine.

Next up: Add a bit of style to Hello World