Find PHP and related plug-ins to customize the tool for your needs. Start with PHP.net and work through the resources to equip your workbench with the tools you need.
PHP downloads are here for everyone to get the latest version of the PHP source code and binaries for Windows.
This site includes an array of Zend-created technical documentation and downloads. Includes forums and an online store for development tools.
Visit this near-definitive resource for PHP-related projects.