Before you debug Phalanger apps, you need to take care of the following. In the debug mode, Visual Studio does not show the runtime values of PHP variables on mouse over. Instead you will need to use the Locals window.

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To inspect the runtime values of PHP variables, you will need to launch the Locals window, while in debug mode, via Debug> Windows> Locals. In this window, you can spot the local (to a function) variables. To look at global variables, expand the <context> tree and you will see the runtime values of the global PHP variables under Global Variables.