Gtk2_VarDump is a simple GUI to examine PHP variables, for example complex arrays or objects. It displays the variable and all sub-variables/array keys/sub-objects in the left pane (a GtkTreeView), and the actual values in a list view on the right side.
The class is very easy to use: Just include the file, and call the static display method with the variable you want to have dumped.
Example 46-1. Showing a variable with Gtk2_VarDump