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That was back in 1998. PHP4 provided another speed burst, as it introduced the ZendEngine.However, the majority of PHP 4's changes were behind thescenes. Thosefeatures allowed more people than ever to use PHP, but itdidn't providethem with more tools to build their sites. Finally,after six years, the community has revisited the legacybaggage thatmade tackling some problems unnecessarily difficult. Inparticular, PHP 4's version of object-oriented programming (OOP)lacksmany features, the MySQL extension doesn't support the new MySQL4.1client protocol, and XML support is a hodgepodge. Fortunately, PHP 5 improves on PHP 4 in three major areas:
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