nginx url rewrites for php-urls

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http://serverfault.com – i have to permament redirect some old urls in nginx. the old urls are old-style php urls including a parameter for loading content. they look like this: http://www.foo.com/index.php?site=foo http://www.foo.com/index.php?site=bar i want to redirect them to other urls like: http://www.foo.com/news http://www.foo.com/gallery any advice on how i can achieve this? my tries failed. thanks in advance! (HowTos)