Personal Home Page – PHP Hypertext Processor
1997 – PHP/FI 2 solely handled by Rasmus
1998 – Zeev and Andi teamed up with Rasmus to give a new face to PHP by rewriting the core engine and a facility to interface with different technologies using API giving rise to the next version PHP 3. PHP 3 continuously parsed the scripts when they were getting executed.
2002 – Zeev and Andi looked back and felt that the core engine would have been written better by enabling the concept of “compile first and execute later”. Zend engine (Zeev Andy) became the heart of PHP 4 which converted the byte code to machine readable form. It was in this version that an abstraction layer was built to handle multitude of servers.
2008 – PHP 5 stable version was released which supported OOP concept with numerous site enhancing improvements. Zend engine II started its development in year 2004.
