in PHP 5 are passed by reference
, can now be defined within the scope of a class.
Class methods and properties can now be declared as public, private or protected
Classes and methods can also be declared as final to prevent further inheritance
can be used to define common APIs.
provide models for class implementations that follow a specific blueprint.
PHP Data Objects extension provides a unified DB access extension
Standard PHP Library
(SPL) provides numerous interfaces.
Allows for runtime introspection of executing PHP code. ➥ Questions