Double Meta Refresh or PhP Redirect?

i want to promote a cpa offer on facebook ppc.

the offer allows socialnet promotions so this won't be a problem.

i do not need to hide my traffic source but i do not want my affiliate manager to see my keywords.will facebook let the keywords to be pass if i use simple php redirect?

my question is: can i use simple php redirect or should i use double meta refresh?
can you explain the reason of your reply please?