Does die() do an ob_end_flush()?

Question

I can't seem to find a good answer on this anywhere. If I am running output buffering, and a die() is fired, does that kick off an ob_end_flush() as well?

Answer 1

Yes it does. Any time the script ends gracefully, the buffers will be emptied. The only non-graceful endings are if it segmentation faults or if it's killed (signal 9 SIG_KILL). The only place that die() does a hard-kill of the process is if you call it inside of a register_shutdown_function (But the buffers are flushed before the shutdown function is called, so there's no issue there). See Connection Handling for some more information...

Answer 2

Yes.

However, you can make the output empty if you have

register_shutdown_function('ob_clean');

earlier in the code.

In some cases we did not want to output the ob on a die(). I write this here in case it could help anyone who wants to do the same.