[php-src] Issue #7778: Enum could not be converted to string with \array_intersect

Issue: https://github.com/php/php-src/issues/7778 Comment Author: iluuu1994 That comes down to how array_intersect works. https://www.php.net/manual/en/function.array-intersect.php > **Note**: Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. > In words: when the string representation is the same. array_intersect will also not work for other objects that don't implement __toString and it might unintentionally match objects that coincidentally return the same string. I think at this point we'd be better off adding a new array_intersect alternative that uses strict comparison instead. Any change here will likely require an RFC.