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Peter Lavin This chapter is excerpted from Object-Oriented PHP: Concepts, Techniques, and Code from NoStarch Press . PHP 3 was released in mid-1998. Some basic object-oriented (OO) capabilities were included, more or less as an afterthought, to "provide new ways of accessing arrays." 1 No significant changes were made to the object model when version 4 was released in mid-2000. The basics of object-oriented programming (OOP) were there--you could create a class and single inheritance was supported. With the release of PHP 5 in 2004 there was plenty of room for improving PHP's OO capabilities.