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As an extension to CSS, LESS is not only backwards compatible with CSS, but the extra features it adds use existing CSS syntax. This makes learning LESS a breeze, and if in doubt, lets you fall back to CSS.

PHP is the most widely-used language for programming on the web. Here are thirty best practices for beginners wanting to gain a firmer grasp of the fundamentals. Editor's Note: The "Best Practices" series has been my baby for three articles now.