Goofing around with DCI, inspired by https://gist.github.com/Ikke/4075281

gistfile1.php

<?php

Trait MethodDelegator
{
	private $roles = array();

	private $method_map = array();

	public function delegate($class)
	{
		$role = new $class($this);
		$this->roles[$class] = $role;

		foreach(get_class_methods($class) as $method)
		{
			$this->method_map[$method] = $role;
		}
	}

	public function remove_delegation($class)
	{
		$role = $this->roles[$class];
		unset($this->roles[$class]);

		$this->method_map = array_filter(
			$this->method_map,
			function($stored_role) use($role)
			{
				return $stored_role !== $role;
			}
		);
	}

	public function __call($method, $args)
	{
		if ( ! array_key_exists($method, $this->method_map))
			throw new Exception("Method $method doesn't exist on this object");

		call_user_func_array(
			array($this->method_map[$method], $method), $args
		);
	}
}

class Role {
	private $entity;

	public function __construct($entity)
	{
		$this->entity = $entity;
	}

	public function __get($property)
	{
		return $this->entity->$property;
	}

	public function __set($property, $value)
	{
		$this->entity->$property = $value;
	}
}

class Repository {
	public function create() {}
}

// ------------------------------------------------------------

class Role_Account_Guest extends Role {

	public function assign_values(array $data)
	{
		// echo 'Role Account Guest:<br />';
		// var_dump($this);

		$this->title     = $data['title'];
		$this->active    = (bool) $data['active'];
		$this->created   = time();
		$this->modified  = NULL;
		$this->deleted   = NULL;
	}

}

class Model_Account {
	use MethodDelegator;

	public $id;
	public $title;

	public $active;

	public $created;
	public $modified;
	public $deleted;
}

// ------------------------------------------------------------

class Context_Account_Add {

	protected $_data;
	protected $_account;
	protected $_repo;

	public function __construct(array $data, Model_Account $account, Repository $repo)
	{
		$this->_data = $data;
		$this->_account = $account;
		$this->_repo = $repo;
	}

	public function execute()
	{
		$this->_account->delegate('Role_Account_Guest');

		// Call Role_Account_Guest::assign_values()
		$this->_account->assign_values($this->_data);

		// Store
		$this->_repo->create($this->_account);

		echo 'Context Account Add:<br />';
		var_dump($this->_account);
	}
}

// ------------------------------------------------------------

$context = new Context_Account_Add(
	[ 'title' => 'Test account', 'active' => 1 ],
	new Model_Account,
	new Repository
);

$context->execute();