What is the best free PHP framework working on shared hosting and why?

/home
  |
  /cakephp - complete copy of default cake folder
  |          with /cake, /app, /vendors etc left untouched
  |
  /public_html - default shared webroot folder
  |              place your customised cake /webroot folder in here with
  |              index.php, /css /js folders etc
  |
  /app - place your customised cake /app folder here, without the /webroot
         contains your /controllers, /models etc folders

if (!defined('ROOT')) {
	define('ROOT', '/home/app');
}

if (!defined('APP_DIR')) {
	define('APP_DIR', basename(dirname(dirname(__FILE__))));
}

if (!defined('CAKE_CORE_INCLUDE_PATH')) {
    define('CAKE_CORE_INCLUDE_PATH', ROOT . DS . 'cakephp');
}