WPDebugger is a WordPress plugin by ysalame that lists multiple variables responsible for the execution of each page along with database queries.
Upload the contents of the plugin to the /wp-content/plugins/ directory
Activate the plugin through the ‘Plugins’ menu in WordPress
In the Admin section a new Menu will be present named PhiMind. On the Sub-Menu Debugger you need to turn the plugin on and select all options you wish to use.