DI Example http://mnapoli.github.com/PHP-DI/

dependency_anotation.php

use DI\Annotations\Inject;

class Foo {
    /**
     * @Inject
     * @var Bar
     */
    private $bar;

    public function __construct() {
        // The dependency is injected
        return $this->bar->sayHello();
    }
}