$_GET strings seperation

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Hello Everyone,

I have a problem with GET strings. I use
$_SERVER["REDIRECT_QUERY_STRING"] to get the value-pairs in the URL.
The problem is that there is a cID variable that keeps appending itself
to the string continuously everytime someone clicks on a different
category link on the website. For example, instead of this:

http://www.someexample.com/admin/index.html?cID=42&somevar=value&somevar2=value2

it keeps appending another cID to it everytime it goes to a different
link, like this:

http://www.someexample.com/admin/index.html?cID=42&cID=39&cID=44&cID=37&somevar=value&somevar2=value2

I know that this is happening because I'm appending it with the dot (.)
but is there a way to just inject a single cID and still have the rest
of the value-pairs available? Something built into PHP, maybe a different
predefined variable I don't know about? Or, do I have to make a
complex function to separate each out and then put it back together
again like humpty dumpty? Is there an easier way to do this and still
have a single cID variable in the GET string? Thanks in advance.

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