Avoid PHP warnings due to lack of args in exception trace on PHP 7.4

[clue]

It looks like some installations of PHP 7.4 do not report the "args" in the exception trace anymore. This can lead to reporting some PHP warnings (PHP Warning: Invalid argument supplied for foreach()) and/or rejected promises depending on the error handler used.

Accordingly, this didn't show up during unit tests because PHPUnit transforms these warnings into exceptions automatically which will cause the underlying promise to be rejected – which will not be reported by default (reactphp/promise#87). This can be best reproduced by running one of the examples with an invalid DNS server address and error reporting enabled. This should now report a promise rejection without any PHP warnings.

Builds on top of clue/reactphp-http-proxy#33 and #118.

[ghost]

There is a new INI setting called zend.exception_ignore_args in PHP 7.4:

zend.exception_ignore_args is a new INI directive for including or excluding arguments from stack traces generated from exceptions.

https://www.php.net/manual/en/migration74.other-changes.php#migration74.other-changes.ini
https://3v4l.org/CS8S9

[clue]

There is a new INI setting called zend.exception_ignore_args in PHP 7.4 […]

Thanks for the find @CharlotteDunois, that's the configuration I was missing! It's my understanding this confirms this suggested changeset makes sense as-is 👍