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![]() Objects implementing ArrayAccess can be used with array syntax and objects implementing Iterator or IteratorAggregate can be used with the foreach language construct. There are special interfaces that allow objects to interact with the runtime system. Furthermore, PHP 5 added interfaces and allowed for multiple interfaces to be implemented. It also introduced a standard way of declaring constructors and destructors, similar to that of other object-oriented languages such as C++, and a standard exception handling model. ![]() PHP 5 introduced private and protected member variables and methods, along with abstract classes and final classes as well as abstract methods and final methods. In the new approach, objects are referenced by handle, and not by value. The drawback of this method was that the whole object was copied when a variable was assigned or passed as a parameter to a method. In previous versions of PHP, objects were handled like value types. Object handling was completely rewritten for PHP 5, expanding the feature set and enhancing performance. Basic object-oriented programming functionality was added in PHP 3 and improved in PHP 4. ![]()
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