Question

If I create a registry object to store other objects and settings in like this…

$registry = Registry::getInstance();

And then create 2 other objects and pass the Registry object into them like this below…

$core = new core($registry);
$database = Database::getInstance($registry);

and then later in the script I add some objects to the Registry object…

// Store some Objects into our Registry object using a Registry Pattern
$registry->storeObject("database", $database);
$registry->storeObject("session", $session);
$registry->storeObject("cache", $cache);
$registry->storeObject("user", $user);

Will methods in the core and database objects that were created at the top, still have access to all the objects that I store into the registry even though the other objets were stored into the registry AFTER the core and database Objects were created?

Answer 1

yes they will, objects are passed by reference (in php >= 5) so, each variable will refer to the same underlying object.

in old php, you would need to pass by ref:

$obj->registry =& $registry;

function f(& $registry) { // $registry is a reference }

the key in php <5 is the ampersand syntax when assigning and in function declarations.