PHP emitting 500 on errors – where is this documented?

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Not sure, but this may have been added in PHP 5.2.4:

  • Changed error handler to send HTTP 500 instead of blank page on PHP errors. (Dmitry, Andrei Nigmatulin)

There is also this discussion on the internals list that might be related:

Quoting:

Current time most PHP instalations use setting ‘display_error=0’.
This setting hides errors from user but may send to him just a blank page.

The proposed patch sends HTTP 500 response on errors instead of blank pages.
The pages that already wrote something are not affectd.

Any objections or additions?

and the proposed solution/patch seems to be shown here:

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