[12.x] Fix once() cache when used in extended static class #54094
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Using
once()from an extending class in static context will return the same value of the extended class, or vice versa, depending on which class was called first.This change pulls the closure context class using
ReflectionFunctionAbstract::getClosureCalledClass()which is currently undocumented, though it was introduced in 8.1 (php/php-src#8932).Although this is a breaking change, the use case is extremely narrow.