https://www.php.net/manual/de/function.pcntl-wexitstatus.php
PHP: pcntl_wexitstatus - Manual
Lefert den Statuscode eines beendeten Kindes
phppcntlwexitstatusmanual
https://www.php.net/manual/uk/function.pcntl-wexitstatus.php
PHP: pcntl_wexitstatus - Manual
Returns the return code of a terminated child
phppcntlwexitstatusmanual