gistfile1.txt

function add_index() {
	$_SESSION["box"] = $_POST['value'];
}

if(isset($_SESSION["box"])){
  	switch ($output) {
    case 1:
        $boxcolor = "silver";
        break;
    case 2:
        $boxcolor = "pink";
        break;
    case 3:
       $boxcolor = "blue";
        break;

    }
	global $woocommerce;
	$woocommerce->cart->add_fee( __('Box Color : '.$boxcolor.'' , 'woocommerce'), 0);
   
}