PHP: $_POST/GET help please?

How can i access the $_GET variables like $_GET[2]?
Example:
url: site.com/home.php?varone=valone&vartwo=valtwo
echo $_GET[0]; // echos valone
echo $_GET[1]; // echos valtwo

Note: I cant do i like $_GET['varone'] cause its for a universal function. Also i want to do the same thing with $_POST
 
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