This new post from Troels Knak-Nielsen on the SitePoint PHP blog shares a few helpful in-browser development tools that could come in handy in your day to day coding.

While debuggers exists, there isn't much of a tradition for using them in PHP. People have largely come to rely on injecting debugging code directly into the program, for inspecting program scope.

Tools mentioned include traceers and error handlers (like XDebug), some debugging parts of the popular PHP frameworks and the set of *cachegrind tools to help you parse the output of XDebug for profiling your application.