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A registry is a container for storing objects and values in the application space. By storing the value in a registry, the same object is always available throughout your application.
$registry=new\Phalcon\Registry();// Set value$registry->something="something";// or$registry["something"]="something";// Get value$value=$registry->something;// or$value=$registry["something"];// Check if the key exists$exists=isset($registry->something);// or$exists=isset($registry["something"]);// Unsetunset($registry->something);// orunset($registry["something"]);
In addition to ArrayAccess, Phalcon\Registry also implements Countable (count($registry) will return the number of elements in the registry), Serializable and Iterator (you can iterate over the registry using a foreach loop) interfaces. For PHP 5.4 and higher, JsonSerializable interface is implemented.
Phalcon\Registry is very fast (it is typically faster than any userspace implementation of the registry); however, this comes at a price: Phalcon\Registry is a final class and cannot be inherited from.
Though Phalcon\Registry exposes methods like __get(), offsetGet(), count() etc, it is not recommended to invoke them manually (these methods exist mainly to match the interfaces the registry implements): $registry->__get(“property”) is several times slower than $registry->property.
Internally all the magic methods (and interfaces except JsonSerializable) are implemented using object handlers or similar techniques: this allows to bypass relatively slow method calls.
Magic getter to get an element from the collection
Magic isset to check whether an element exists or not