A number of tools for the PHP developer are available through PEAR: PHP_CodeSniffer (conformance to Coding Standards) PhpDocumentor (generate documentation) PHP_UML (analyse code, generate UML) And on other PEAR channels: phpunit.de/PHPUnit (unit testing) phpunit.de/phpcpd (copy/paste detection, to spot when to refactor) phpunit.de/phpUnderControl (CruiseControl integration) pear.pdepend.org/PHP_Depend (metric tool)