An object-oriented dynamic web app in 150 lines

htaccess

<ifmodule mod_rewrite.c>
  RewriteEngine on
  # check if requested file exists
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule (.*)$  index.php?action=$1
  #RewriteRule ^(.*)/(.*)/(.*)$  index.php?p=$1&$2=$3 [L]
</ifmodule>

TinyMVC.php

<?php 
/*	Tiny MVC, v.1.0.

	Author: James Tarleton

	System Requirements:
		* PHP 5+
		* Web server (Optional)
		* PDO_MYSQL driver for PHP (Optional) 

	Configuration:
		1. Fill in DB credentials, if applicable
		2. Add some view markup (tpl.html) or use default
*/

/* Config
//privateconfig.inc.php
define('PVTCONFIG_DBHOST','');
define('PVTCONFIG_DBNAME','');
define('PVTCONFIG_DBUSER','');
define('PVTCONFIG_DBPASS','');
define('PVTCONFIG_DBPORT','');  
*/
require_once('/privateconfig.inc.php');
class Config
{
	const DBENABLED = true;
	public $config;
	
	private function __construct()
	{
		$this->config = array('connection' =>array(
				'dsn' => sprintf('mysql:host=%s;port=%s;dbname=%s', PVTCONFIG_DBHOST, PVTCONFIG_DBPORT, PVTCONFIG_DBNAME),
				'dialect' => '',
				'username'=> PVTCONFIG_DBUSER,
				'password'=> PVTCONFIG_DBPASS
			)
		);
	}
	static public function getInstance()
	{	
		return new self;
	}
}
/******************************************************************* 
"Model"
*/
class DB
{
	static public function getCon()
	{
		$config = Config::getInstance()->config;
		try 
		{
			if(Config::DBENABLED) 
			{
				$pdo = new PDO(@$config['connection']['dsn'], 
					@$config['connection']['username'], 
					@$config['connection']['password']
				);
				$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
				return $pdo; 
			}
		} 
		catch (PDOException $e) 
		{
			printf('PDO ERROR: %s', $e->getMessage());
			exit(0); 
		}
	}

}
class Foo extends DB
{
        public $db;
	public $color, $birthplace, $birthday;
	
	public function __construct($color='lime')
	{
		$this->db = parent::getCon();
		$this->color = $color;
	}
	
	static public function getFoos($color)
	{
		$db = parent::getCon();
		$objs = array();
		for($k=0;$k<20;$k++)
		{
			$something = new self($color); 
			//Foo object is born
			$something->birthday = time();
			$something->birthplace = get_class($db); //etc...
			$objs[] = $something; 
		}
		return $objs;
	}
}
/******************************************************************* 
"View"
*/

class Layout
{

	static public function getFormat()
	{
		$f= file_get_contents('tpl.html');
		$f=trim($f);
		return $f;		
	}
}

class Form
{
	static public function rndr($action)
	{
		$form = '<form action="index.php" method="get"><label for="action">Foo</label><select id="food" name="action" onChange="mysubmit(form);">';
		$form .= (empty($action)) ? '<option selected="selected" value =\'\'>Select</option>'
			:'<option value =\'\'>Select</option>';
		foreach(array('lime','salmon') as $val)
		{
			$sel =($val==$action) ?'selected="selected"' : '';
			$form .= sprintf('<option %s value="%s">%s</option>', $sel, $val, $val);
		} 
		$form .= '</select></form>'; 
		return $form;
	} 
}

/*******************************************************************
"Controller" 
*/
//action controller
class Actions
{
	static public function getInstance()
	{ 
		return new self; 
	}
	public function dispatchRequest(array $req)
	{
		$action=$req['action'];
		$data=Foo::getFoos($action); //get some foos!
		return self::callLayout($req, $data);		
	}

	//call html w request and presentation array
	static public function callLayout(array $req, array $data)
	{ 
		ob_start();
		echo Form::rndr($req['action']);
		foreach($data as $foo)
			echo sprintf('<div class="%s">A %s %s was born on %s in %s.</div>', $foo->color,$foo->color, get_class($foo), 

date('m/d/Y',$foo->birthday),
$foo->birthplace ); 	  
				
		echo sprintf(Layout::getFormat(), ob_get_clean());
	}
}
//Last but not least, a front controller
switch(PHP_SAPI)
{
	case'cli':
		Actions::getInstance()->dispatchRequest();
		
		exit(0);
	default:
		!empty($_GET['action']) ? Actions::getInstance()->dispatchRequest($_REQUEST) 
			: Actions::getInstance()->dispatchRequest(array('action'=>'salmon'));
		exit(0); 
}

tpl.html

<!DOCTYPE html>
<html lang="en">
<head>
	<title>TinyMVC 1.0</title>
	<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" />
	<script type="text/javascript">
	function mysubmit(frm)
	{
		var e=document.getElementById('food');
		var sele =e.options[e.selectedIndex].value;
		return (sele.length > 0 ) ? frm.submit() : false;
	}
	</script>
	<style type="text/css">
		*{margin:0;padding:0;font-family:Verdana,sans-serif; font-size:14px;} 
		.lime{border:1px solid green;color:green;margin:20px;padding:10px;background-color:lime;}
		.salmon{border:1px solid crimson; color:crimson;margin:20px;padding:10px;background-color:salmon;}
		label{ line-height:20px; margin:20px; padding:10px; color:#666;}
		select{ line-height:20px; margin:20px; padding:10px; color:gray;background:#FAFAFA; border:1px solid lightgray; }
	</style>
</head>
<body>
%s
</body>
</html>