if($_POST['action'] == 'show')
{
if(isset($_COOKIE["favorites"]))
{
    $cookie_data = stripslashes($_COOKIE['favorites']);
    $cart_data = json_decode($cookie_data, true);
    //$item_id_list = array_column($cart_data, 'ID');
    foreach($cart_data as $keys => $values)
    {
        if($cart_data[$keys]["ID"] == $_POST["id"])
        {
            echo "true";
        } else {
            echo "false";
        }
    }
}
 }