Joomla! Documentation™

<?php
// No direct access
defined( '_JEXEC' ) or die( 'Restricted access' );
// Require the base controller
require_once( JPATH_COMPONENT.DS.'controller.php' );
// Require specific controller if requested
if($controller = JRequest::getWord('controller')) {
    $path = JPATH_COMPONENT.DS.'controllers'.DS.$controller.'.php';
    if (file_exists($path)) {
        require_once $path;
    } else {
        $controller = '';
    }
}
// Create the controller
$classname    = 'HelloController'.$controller;
$controller   = new $classname( );
// Perform the Request task
$controller->execute( JRequest::getVar( 'task' ) );
// Redirect if set by the controller
$controller->redirect();

<?php
/**
 * @package    Joomla.Tutorials
 * @subpackage Components
 * @link http://docs.joomla.org/Developing_a_Model-View-Controller_Component_-_Part_1
 * @license    GNU/GPL
 */
// No direct access
defined( '_JEXEC' ) or die( 'Restricted access' );
jimport('joomla.application.component.controller');
/**
 * Hello World Component Controller
 *
 * @package    Joomla.Tutorials
 * @subpackage Components
 */
class HelloController extends JController
{
    /**
     * Method to display the view
     *
     * @access    public
     */
    function display()
    {
        parent::display();
    }

}<
/source>
<source lang="php"><?php
/**
 * @package    Joomla.Tutorials
 * @subpackage Components
 * @link http://docs.joomla.org/Developing_a_Model-View-Controller_Component_-_Part_1
 * @license    GNU/GPL
*/

// no direct access

defined( '_JEXEC' ) or die( 'Restricted access' );

jimport( 'joomla.application.component.view');

/**
 * HTML View class for the HelloWorld Component
 *
 * @package    HelloWorld
 */

class HelloViewHello extends JView
{
    function display($tpl = null)
    {
        $greeting = "Hello World!";
        $this->assignRef( 'greeting', $greeting );

        parent::display($tpl);
    }
}

defined('_JEXEC') or die('Restricted access'); ?>

<?php echo $this->greeting; ?>

</source>

<?xml version="1.0" encoding="utf-8"?>
<install type="component" version="1.5.0">
<name>Hello</name>
 <!-- The following elements are optional and free of formatting conttraints -->
 <creationDate>2007-02-22</creationDate>
 <author>John Doe</author>
 <authorEmail>john.doe@example.org</authorEmail>
 <authorUrl>http://www.example.org</authorUrl>
 <copyright>Copyright Info</copyright>
 <license>License Info</license>
 <!--  The version string is recorded in the components table -->
 <version>1.01</version>
 <!-- The description is optional and defaults to the name -->
 <description>Description of the component ...</description>

 <!-- Site Main File Copy Section -->
 <!-- Note the folder attribute: This attribute describes the folder
      to copy FROM in the package to install therefore files copied
      in this section are copied from /site/ in the package -->
 <files folder="site">
  <filename>controller.php</filename>
  <filename>hello.php</filename>
  <filename>index.html</filename>
  <filename>views/index.html</filename>
  <filename>views/hello/index.html</filename>
  <filename>views/hello/view.html.php</filename>
  <filename>views/hello/tmpl/default.php</filename>
  <filename>views/hello/tmpl/index.html</filename>
 </files>

 <administration>
  <!-- Administration Menu Section -->
  <menu>Hello World!</menu>

  <!-- Administration Main File Copy Section -->
  <files folder="admin">
   <filename>hello.php</filename>
   <filename>index.html</filename>
  </files>  

 </administration>
</install>