I am releasing a PHP application for a friend to use, should I copyright it?

Im Spazzoid

New Member
I made a somewhat large PHP application to handle automated queries for any site (plugged into their existing site structure), it was more of a "challenge" with a reward in the end open to anyone. I put quite a few days into it, I don't want to be mean but I see all the time things like this copyrighted by people.What would be any benefits, should I place a copyright message in the source, just to claim that I wrote it (be proud of it)? Or should I release it to public domain? I just wanted to get input before I went further.
 
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