In this chapter, we discussed different tools to debug a PHP application. We used Xdebug, Sublime Text 3, and Eclipse to debug our applications. Then, we used the Xdebug profiler to profile an application to find out the execution statistics. Finally, we discussed PHP DebugBar to debug an application.
In the next chapter, we will discuss load testing tools, which we can use to place load or virtual visitors on our application in order to load test it, and find out how much load our application can bear, and how it affects the performance.