Detect XDebug triggers and skip profiling

[erikwebb]

When using XHProf normally, XDebug-triggered runs are slow, but I just discard them. With xhgui however, the aggregates get skewed when these runs appear.

[markstory]

Ok, any idea no how you would like to see these requests handled? Normally I would just recommend not using both xdebug and xhprof to profile at the same time.

[erikwebb]

I will look into it. I just put this down to remind myself before I can address it. I'm sure there is an environment variable or something.

[preinheimer]

Could something like xdebug_is_enabled() be checked inside profiler.enable? or is that the item we need?

[markstory]

@preinheimer seems like that would be a good way to exclude doubly profiled requests.

[preinheimer]

I feel like the answer here is to have a like config.more.examples or something, showing further edge cases like this, or more advanced methods of deciding to profile.