Fix segfault comparing uninitialized SimpleXMLElement instances - #23067
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Fix segfault comparing uninitialized SimpleXMLElement instances#23067iliaal wants to merge 1 commit into
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sxe_objects_compare dereferenced document->ptr when both nodes were NULL without checking document. A subclass that skips parent __construct leaves document NULL, so $a == $b segfaulted. Treat two NULL documents as equal and mixed NULL/non-NULL as uncomparable. Closes phpGH-23067
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sxe_objects_compare reaches sxe1->document->ptr whenever both operands have a NULL node, without checking that document is set. A subclass whose constructor skips parent::__construct leaves both fields NULL, so
new MySXE == new MySXEdereferences NULL and segfaults. Two unset documents now compare equal, and an unset one against a live document is uncomparable, matching the node comparison directly above.