[GIT-PULLS] [php-src] PR #23236: [RFC] Deprecate `is_a()` and `is_subclass_of()` with string when not allowed

[email protected] (DanielEScherzer)
Newsgroups php.git-pulls
Message-ID <aXSbVv3zUkKXuNOhtLCgxNUqAtxTHv8Hh0mEuLSCtak@main.internal.php.net> 
Pull Request: https://github.com/php/php-src/pull/23236
Author: DanielEScherzer

For `is_a()` and `is_subclass_of()`, emit deprecation warnings when calling with a string as the first argument but with `$allow_string` being false. The two functions share implementation code and so are updated together.

https://wiki.php.net/rfc/deprecations_php_8_6
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