pass & character in a GET

How can i pass a & character in a get like this:

script.php?file_name=A&a开发者_StackOverflowmp;O.jpg

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You have to url-encode the char (as %26), see http://www.blooberry.com/indexdot/html/topics/urlencoding.htm

There are functions to do that in many programming langs, such as urlencode() in PHP.