PHP Testing and Optimization Tools

PHPUnit
PHPUnit is a complete port of the popular JUnit unit testing suite to PHP 5. It’s a tool that helps you test your Web application’s stability and scalability. Writing test cases within the PHPUnit framework is easy; here’s how to do it.
SimpleTest
SimpleTest is a straightforward unit-testing platform for PHP applications. To get up and running with SimpleTest quickly, read through this pragmatic tutorial that shows you how to create a new test case.
Selenium
Selenium Remote Control (RC) is a test tool that allows you to write automated Web application UI tests in any programming language against any HTTP website using any mainstream JavaScript-enabled browser. It can be used in conjunction with PHPUnit to create and run automated tests within a Web browser.
PHP_CodeSniffer
PHP_CodeSniffer is a PHP 5 script for detecting conformance to a predefined PHP coding standard. It’s a helpful tool for maintaining uniform coding styles for large projects and teams.
dBug
dBug is ColdFusion’s cfDump for PHP. It’s a simple tool for outputting data tables that contain information about arrays, classes and objects, database resources and XML resources, making it very useful for debugging purposes.
PHP Profile Class
PHP Profile Class is an excellent PHP profiling tool for your Web applications. Using this class will help you quickly and easily gain insight into which parts of your app could use some refactoring and optimization.