How to create a stand-alone application using the Joomla! Platform

<?php
define('_JEXEC', 1);
define('JPATH_BASE', dirname(__FILE__));
 
require '../libraries/import.php';
 
class HelloWorld extends JApplicationCli
{
    public function execute()
    {
        $this->out('Hello World');
    }
}
 
JApplicationCli::getInstance('HelloWorld')->execute();

<?php
define('_JEXEC', 1);
 
require '../libraries/import.php';
 
class JoomlaRocks extends JApplicationCli
{
    public function execute()
    {
       $this->out('   .           .     .__       |      | ');
       $this->out('   | _  _ ._ _ | _.  [__) _  _.|_/ __ | ');
       $this->out('\__|(_)(_)[ | )|(_]  |  \(_)(_.| \_)  * ');
    }
}
 
JApplicationCli::getInstance('JoomlaRocks')->execute();

<?php
define('_JEXEC', 1);
 
require '../libraries/import.php';
 
class HelloYou extends JApplicationCli
{
    public function execute()
    {
       $this->out('What is your name?');
       $name = $this->in();
 
       $this->out();
       $this->out('Hi '.$name.',');
       $this->out('Welcome to the Joomla Platform!');
       $this->out();
    }
 
    /**
    * We don’t really need configuration for this application.
    *
    * @return  void
    */
    protected function fetchConfigurationData()
    {
       return array();
    }
}
 
JApplicationCli::getInstance('HelloYou')->execute();

<?php
define('_JEXEC', 1);
 
require '../libraries/import.php';
 
class TwitterFeed extends JApplicationCli
{
    public function execute()
    {
        $this->out('What is your twitter handle?');
        $username = $this->in();
 
        $this->out('How many tweets to view?');
        $count = $this->in();
 
        $tweets = $this->latest_tweet($username, $count);
        $this->out($tweets);
    }
 
    // Get Latest Tweet
    private function latest_tweet($username, $count = 5)
    {
        $url = 'http://twitter.com/statuses/user_timeline/'.$username.'.xml?count='.$count;
 
        $xml = simplexml_load_file($url) or die('could not connect');
 
        $text = '';
 
        foreach($xml->status as $status)
        {
            $text .= $status->text."\n";
        }
 
        return $text;
    }
}
 
JApplicationCli::getInstance('TwitterFeed')->execute();

define('_JEXEC', 1);
 
// Fix magic quotes.
@ini_set('magic_quotes_runtime', 0);
 
// Maximise error reporting.
@ini_set('zend.ze1_compatibility_mode', '0');
error_reporting(E_ALL);
ini_set('display_errors', 1);
 
/*
 * Ensure that required path constants are defined.
 */
if (!defined('JPATH_BASE'))
{
        define('JPATH_BASE', realpath(__DIR__));
}
 
define('JPATH_LIBRARIES',               JPATH_BASE . '/libraries');
 
/**
 * Import the platform. This file is usually in JPATH_LIBRARIES 
 */
require_once JPATH_LIBRARIES . '/import.legacy.php';
 
/**
 * Import the application.
 */
require_once JPATH_BASE.'/includes/application.php';
 
 
// Instantiate the application.
$web = MyWebApp::getInstance('MyWebApp');
 
// Run the application
$web->execute();

/**
 * Override the doExecute method from JApplicationWeb. Here you define what your application does. 
 */
class MyWebApp extends JApplicationWeb
{
                /**
                 * Display the application.
                 */
                protected function doExecute(){
 
                        $this->setBody(
                                '<h1>My Web Application</h1>'.
                                'The current URL is '.JUri::current().'<br/>'.
                                'The date is '. JFactory::getDate('now')
                        );
                }
}