'Why can't I do a comment ( /* like this one */ ) in PHP?

I just downloaded all the PHP's extensions, and this error popped off:

And I did what the error says, and when I started coding, I wasn't able to do a comment with /* This is a comment */

php

Solution 1:^[1]

Try to do something like this:

<!-- Write your comments here -->

because you want to comment in an HTML file.

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Solution	Source
Solution 1	Peter Mortensen