gen_stub: make use of PHP 8.0 and PHP 8.1 features (2)#21479

DanielEScherzer wants to merge 3 commits intophp:masterphp/php-src:masterfrom

DanielEScherzer:stub-new-php-features-2DanielEScherzer/php-src:stub-new-php-features-2Copy head branch name to clipboard