Navigating to the Source Code from the Debug Tool Window
To jump to the declaration of a variable or field, select the desired item in the Variables pane and press F4 or choose from the context menu.
to navigate to the definition of the class of the selected variable or field.
Suppose, you have
$my_car = new Car();.
If you select
$my_car in the Variables pane,
then choosing will bring you to
$my_car = new Car();
while choosing will bring you to