... PHP 4 provided another speed burst, as it introduced the Zend Engine. However, the majority of PHP 4's changes were behind the scenes. Those features allowed more people than ever to use PHP, but it didn't provide them with more tools to build their sites. ... [full article
"I was always thinking of going through complete list of PHP 5 enhancements... this article is kind of talks about all the new additions and improvements!" - yamy
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