Highlight PHP even when not starting with <?php

[janedbal]

Have you searched existing Github issues to see if someone has already requested this feature?
Yes

Is your feature request related to a problem? Please describe.
Any copy-pasted block of PHP code is not highlighted unless I add <?php which is very annoying

Describe the solution you'd like
Highlight PHP code even without the start tag. Any modern PHP application is not combining HTML with PHP and all php files contains only PHP.

Describe alternatives you've considered
No alternative

Additional context
See screenshot: