use keyword isn't supported

PHP 5.3 introduced the 'use' keyword for lambda functions. WebIDE 387 doesn't recognize it

Example code

class Cart {
     const PRICE_BUTTER  = 1.00;
     const PRICE_MILK    = 3.00;
     const PRICE_EGGS    = 6.95;
     protected   $products = array();
         public function add($product, $quantity)
     {
         $this->products[$product] = $quantity;
     }
         public function getQuantity($product)
     {
         return isset($this->products[$product]) ? $this->products[$product] :                FALSE;
     }
         public function getTotal($tax)
     {
         $total = 0.00;
                 $callback =
            function ($quantity, $product) use ($tax, &$total)
             {
                 $pricePerItem = constant(__CLASS__ . "::PRICE_" .
                     strtoupper($product));
                 $total += ($pricePerItem * $quantity) * ($tax + 1.0);
             };
                 array_walk($this->products, $callback);
         return round($total, 2);;
     }

}