Set a $_GET value

PHP Code:

localhost?foo=bar
$_GET['foo'] = 'baar'; 
echo $_GET['foo']; // 'baar'

localhost?foo=bar
$_GET['foo'] = 'baar'; 
echo $this->request->getGet('foo'); // 'bar' 


I encountered a loop because I couldn't update the $_GET parameters during the same request.

PHP Code:

# Solution? 
$this->request->setGet('foo', 'bar');  
$this->request->setPost('foo', 'bar');  


Is this possible?