Apache rewrite rule with original URL containing parameters

So let's say you want to redirect http://example.org?id=2392 to http://example.org?id=256

You need to use the %{QUERY_STRING} option under RewriteCond like this:

RewriteCond %{QUERY_STRING} id=2392
RewriteRule ^/index.php http://example.org/index.php?id=256 [L,R=permanent]