'Why is this line of code causing an error in HTML validator? [closed]

I'm writing a website that needs to be W3C compliant. Everything is validated correctly until I use PHP tags. This line of code specifically: <?php include 'menu.html'; ?> The error given is:

Saw <?. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)

How can this be fixed?

phphtml


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