The xdebug_get_function_stack() method returns the stack trace where it was called. Inside an exception handler, set with set_exception_handler() this then returns the stack trace from within that handler, but not the stack trace from where the exception was called, which is much more interesting.

Add a new option to xdebug_get_function_stack() called from_exception that takes a Throwable as argument, and if a stack trace is available when this throwable was created, return it, instead of the stack trace from where it was called. This stack trace will always have local_vars and params_as_values set, so that these argument and local variable values can be accessed.