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http://phptherightway.com is a good place to start, if you haven't read it before. It's opinionated, and not necessarily a guide follow down to the letter, but it can put you on the right track.

Ha ha --- I should have thought to search for that!

It seems to be a bit light on advice in places. e.g. the section on comparison operators lightly mentions the difference between == and === but doesn't say anything about when they should be used. As that's one of the traditional PHP gotchas I would have expected more there.

Anyway, thanks; I'll check it out.

http://www.phptherightway.com/

O'Reilly's "Modern PHP" (270 pages) is a fantastic introduction to the new way of doing PHP.