Can 'set ' be elided? When?

I notice that some settings use the format ':set name=value' and other
use ':name value'. For instance:
:set syntax=php
:syntax off

Can the string 'set ' always be safely elided? If not, then what are
the guidelines?

Thanks.

--
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com

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