Major changes from PHP4 to PHP5:
* Features such as objects, class constants, visibility, unified destructors and constructors, abstracts, interfaces, magic methods, and other things altered in the Object Model
* PHP5 contains the ability to create classes which you can access akin to arrays through an ArrayAccess interface
* Introduced in PHP5 was limited type hinting, which allows you to dictate which kind of variables pass to functions or class methods
* Exceptions (or errors) were introduced
* A variety of new PHP5 Functions
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