5.15 Next chapterThis is NOT the latest copy of this book; click here for the latest version.
One of the key differences between PHP 5 and PHP 4 is that the new version has a much more mature implementation of object-oriented programming - the practice of architecting your code for maximum reusability by sectioning up functionality into discrete packages. Indeed, the power offered by PHP's OOP support is so great that it deserves a whole chapter to itself, coming up next.
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