[php-src] Issue #12169: Unable to get comment contents in SimpleXML

Issue: https://github.com/php/php-src/issues/12169 Author: nielsdos ### Description Bug report or feature request, I don't know for sure... Could be considered either? Anyway: ```php <?php $sxe = simplexml_load_string(<<<XML <?xml version="1.0"?> <container> <bar>hi</bar> <!-- comment --> </container> XML); var_dump((string) $sxe->bar); var_dump((string) $sxe->comment); ``` Gives output: ``` string(2) "hi" string(0) "" ``` But I expected: ``` string(2) "hi" string(7) "comment" ``` Looking at the documentation for __toString: https://www.php.net/manual/en/simplexmlelement.tostring.php > Returns text content that is directly in this element. (...) Well, the confusing thing is that every XML node is called a SimpleXMLElement in ext/simplexml, even if they're not XML elements. But that aside, if I read the docs as "Returns text content that is directly in this node." then I would expect the cast to give me the comment contents, as that's the text inside of it.