http://www.potstuck.com/2010/09/09/php-dependency-a-php-dependency-injection-framework/

PHP-Dependency (Pd) is a dependency injection framework and container written in PHP. One of the main features of PHP-Dependency is that it supports class reflection, which means you do not have to maintain ANY configuration files.

Class MyExample() {

    private $_database;

    /**
     * This is the constructor, the database is automatically injected
     * due to the PdInject DocBlock.
     *
     * @PdInject database
     */
    public function __construct($database) {
        $this->_database = $database;
    }

}

That's it. No configuration other than that one line Doc Block.

You need to make sure that the Pd library is on your include path.

set_include_path(
    get_include_path() . PATH_SEPARATOR .
    '/path/to/php-dependency/library/'
);

If you are using a PHP framework with an autoloader then just make sure the library/Pd is on the include path and tell the autoloader to use 'Pd' as the class prefix/namespace.

The container holds all of your dependencies. Adding dependencies to the container is very simple.

$database = new Database("mysql://user:password@server/database");

$container = Pd_Container::get();
$container->dependencies()->set('database', $database);

You can put anything into the container. Objects, arrays, strings, and even anonymous functions.

Class dependencies are defined by PHP Doc Blocks. Every Pd command begins with @PdInject and is followed by a key:value type syntax. The most common command will be injecting a dependency by name, which just requires the dependency name.

Class Book {

    private $_database;

    /**
     * @PdInject database
     */
    public function setDatabase($database) {
        $this->_database = $database;
    }

}

To see a full list of commands/syntax please visit this page.

To create objects use the Pd_Make class.

/* @var $book Book */
$book = Pd_Make::name('Book');

This is the same as doing

$book = new Book();
$book->setDatabase($database);

Note: Use the @var doc line above the Pd_Make command. This will tell your IDE that $book is an instance of the Book class, which will allow the IDE to auto complete any calls/usages of $book in your code.

This is just a brief intro to PHP-Dependency. There are a lot more features located at http://www.potstuck.com/2010/09/09/php-dependency-a-php-dependency-injection-framework/