code: public function remove($strKey)
  	{
  		// Map the referer (see #281)
  		if (\in_array($strKey, $this->mappedKeys))
  		{
  			$this->session->remove($strKey);
  		}
  		else
  		{
  			$this->sessionBag->remove($strKey);
  		}
  	}
docs: Remove a session variable
  
  @param string $strKey The variable name