- Rasmus Lerdorf, 1995
- Perl & C begat PHP/FI and PHP/FI 2.0
- PHP/FI: Personal Home Page: Forms Interpreter
- PHP 3 arrives: Andi Gutmans, Zeev Suraski, Rasmus Lerdorf
- PHP3, June 1998 (official): Extensibility and new name
- PHP4: Zend Engine. Higher performance, wider support, sessions
- PHP5: Zend2 Engine, new object model. Better object orientation
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