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or
keyword, keyword, keyword
You will get many differing opinions on this subject.
To tell you the truth, I am not sure that it makes one iutta of a difference how you arrange them. The engines have downgraded the importance of the keyword tag immensely.
I would try to make sure that the tag on each page contains words that are actually on that particular page. And, of course, research your best targeted keyword phrases first.
@keywords = split(/\,/);
Now keywords and phrases are retained in each element of keywords. That is the way most search engines break apart keywords. If you use commas, your retain the phrases and will be found under "quartz rocks".
Use no comma's and no garantee that your phrases will be retained.
@keywords = split(/ /)
Good by phrases. You will NOT be found under "quartz rocks".