How to run PHP 4 and PHP 5 at the same time on Apache for Windows

This post describes how to set up a single web development environment that allows you to test the same files under PHP 4 and PHP 5 at the same time. The Windows versions of Apache and PHP are described, but the same configuration techniques can be applied to other systems.

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Apache 2, PHP, caching, and relative file path problems

When PHP 4 or 5 is run as an Apache 2 SAPI module, relative file paths passed to functions such as file_exists() may fail when using ob_start() to cache a page.

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