The 'startinline' option is utilized in the `CodeHilite` instantiation
to indicate that the provided PHP code snippet should be highlighted
even if it doesn't start with the opening tag or marker of the
associated programming language (which will rarely be the case in
Zulip, since one discusses a section of a file much more often than a
whole file).
Fixes: https://chat.zulip.org/#narrow/stream/137-feedback/topic/php.20syntax.20highlighting.20should.20not.20require.20.60.3C.3Fphp.60.
Signed-off-by: Akshat <akshat25iiit@gmail.com>
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