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Ruler: A simple stateless production rules engine for PHP 5.3+ What is ruler? Ruler is a simple stateless production rules engine for PHP 5.3+ written by Justin Hileman (@bobthecow). Justin was previously employed at OpenSky but these days you will find him hacking on a new startup named @presentate. What is a rules engine? From martinfowler.com: A rules engine is all about providing an alternativ