Still the case, but not going to be worked on anytime soon. Mostly, because nobody asked for it, and it's going to be really slowing down debugging.

Closing this, as nobody asked for it, and it would mean a big slow down.

Any chance of a reconsideration on this item? This would make the debugger a whole lot more powerful than it is now, as it would enable tracking down the line which causes a condition to change at runtime based on an assumption, which is often the starting point in professional debugging scenarios. I understand it would slow down the debugger but implementing this as a non-default option, it could also save a lot of work. As to your reason "nobody asked for it", by definition at least two people have :) I'm wondering if the advancements in the PHP internals since v5.3 might mean this could be implemented more efficiently than before, if so it would be a star feature for me (given that there are no free alternative debuggers available for PHP)