[GIT-PULLS] [php-src] PR #23230: gen_stub.php clean up and small refactoring

[email protected] (kamil-tekiela)
Newsgroups php.git-pulls
Message-ID <[email protected]> 
Pull Request: https://github.com/php/php-src/pull/23230
Author: kamil-tekiela

When I opened the file, my IDE reported multiple errors and warnings. I fixed the easy-to-fix ones. 

There is one remaining bug with `getFieldSynopsisValueString` which is protected and not visible from EnumCaseInfo, but I am not sure how that was supposed to work so I didn't touch it. 

@kocsismate I have split up the changes into separate commits so that you can reject commits you don't like or that break something.
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