Why are PHP errors printed twice?

Question

Summary

Amazingly I could find nothing about this on Google or SO. When I throw an exception in PHP it appears in my console twice, complete with error message and sta

Answer 1

Got it reproduced. The first error message is a result of the log_errors setting and goes to STDERR.

The second is a result of display_errors and goes to STDOUT.

Both settings can be altered during runtime. So in order to "ask PHP nicely", this suffices:

ini_set('log_errors', 1);
ini_set('display_errors', 0);