Simple Optimization for PHP and MySQL

From a post at dublish.com:

Here is a list of a few very simple tips for optimizing your php/mysql applications. Keep these in mind while developing.

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* This post was originally published on May 19, 2006 at http://www.csb7.com/whyblogwhy/index.php/2006/05/19/simple-optimization-for-php-and-mysql/

There is something to be learned from a rainstorm.
When meeting with a sudden shower, you try
not to get wet and run quickly along the road.
By doing such things as passing under the eaves
of houses, you still get wet. When you are
resolved from the beginning, you will not be
perplexed, though you will still get the same
soaking. This understanding extends to all things.

— Yamamoto Tsunetomo, Hagakure: The Book of the Samauri