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→PHP 4 - Optimization, Scalabilty and More
With PHP 4 Andi Gutmans and Zeev Suraski once again re-architected PHP from the ground up. PHP 4 was built upon a piece of technology called the Zend Engine. The move the Zend Engine brought about a number of key improvements in PHP:
* Support for other web servers (Microsoft's Internet Information Server (IIS) being of particualr signicanceparticular significance).
* Improved memory handling to avoid memory leaks (one of the most difficult types of problems to isolate in a program).