PHP DebugBar is another awesome tool that displays a nice and full information bar at the bottom of the page. It can display custom messages added for the purposes of debugging and full request information including $_COOKIE, $_SERVER, $_POST, and $_GET arrays along with the data if any of them have. Besides that, PHP DebugBar displays details about exceptions if there are any, database queries executed, and their details. Also it displays the memory taken by the script and the time the page is loaded in.
According to the PHP Debug website, DebugBar integrates easily in any application project and displays debugging and profiling data from any part of the application.
Its installation is easy. You can either download the complete source code, place it somewhere in your application, and set up the autoloader to load all the classes, or use composer to install it. We will use composer as it is the easy and clean way to install it.