Using traits to handle service container.

AddressBook.php

<?php

class AddressBook {

	use ServiceConsumer;

	public function findContactByEmail($email)
	{
		// get database connection
		$db = $this->container['database'];

		// use the db connection to query for contact by email address
	}
}

ServiceConsumer.php

<?php

require_once('/path/to/Pimple.php');

trait ServiceConsumer {

	protected $container;

	public function __construct()
	{
		$this->container = new Pimple();

		$this->container['database'] = function () {
			$host = '127.0.0.1';
			$user = 'db_user';
			$pass = 'db_pass';

			return new DatabaseConnection($host, $user, $pass);
		};
	}
}