Possible to rewrite based on referring url?

Server NGINX
1

here is an example called url:
http://myserver.com/index.php?id=15

I would like to change the id= based on referrer…

so I will have a list of referers…

if referer url contains moo/cow.php then rewrite to:
http://myserver.com/index.php?id=15

if referer url contains milk/cookies.php then rewrite to:
http://myserver.com/index.php?id=16

Thanks,

-Eric

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