When it comes to server-side scripting, PHP is the language that comes to mind. When you’re done with your code, there are two kinds of tools that help a lot. Debuggers and Testing and Optimization tools. Here are top most of the best in these segments!
This is an Xdebug profiling web frontend for PHP5. It works on all platforms and takes very little time to install.
This extension lets you debug your scripts and provides a lot of valuable information for you to use.
Use this tool to find logic errors in your PHP code.
This PHP debugger is used for local and remote PHP debugging.
This tool can output processing times for your PHP and SQL get variable dumps in graphical form and check the performance of particular code blocks.
This is an open source PHP debugging tool that can be used for various purposes.
This is a fully featured but live debugger that is meant for the Mac OS.