fix: exit() and dd() support in worker mode (#1946)
* Verifies exit behavior.
* formatting
* Checks for actual exit.
* Fixes test.
* Fixes test.
* Update testdata/dd.php
Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
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Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
