include option

I'm trying to make vim look inside php include files. A php include
statement can be:

include 'file.php'

OR

include_once 'file.php'

It works if I do:

set include=^include

OR

include=^include_once

But I can't seem to do recognize both. This doesn't work:

set include=^\(include\|include_once\)

Thanks!

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