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C4013 warns about undefined functions[1], but for some reason is only a level 3 warning, and such suppressed by default (usually there will be link error afterwards, though). It appears to be sensible to elevate the warning to level 1, so it will be converted to a compile error.
[1] https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-3-c4013
Note that PHP-8.4 and master are already C4013 clean, but PHP-8.3 (or only PHP-8.2) are not.