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Setting the recovery option by using a hardcoded value (1) worked already for SimpleXML. For DOM, a small change is necessary because otherwise the recover field overwrites the recovery option.
From a quick search on GitHub [1] it looks like this won't clash with existing PHP code as no one seems to define (or use) a constant with such a name.
[1] https://github.com/search?q=LIBXML_RECOVER+language%3APHP&type=code&l=PHP