Reading robux4's comments:
(...)
But I'm quite sure there are new PHP functions missing.
That may need more investigation.
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I made some research and, well they are a lot.
I attached here what I think is the complete list of
php keywords that SciTE is lacking.
I took the information from
http://zugeschaut-und-mitgebaut.de/php/
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Just for the record, I submitted this bug. :)
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I don't think we should be distributing such a large set of
information about a particular language with core SciTE -
instead they should be a separate download.