循环数组

<div id="order-item-template" class="hidden">
    <div class="item">
    <?= \yii\bootstrap\Html::activeHiddenInput($model, 'items[product_id][]', ['id' => false, 'class' => 'product_id']); ?>
    <?= \yii\bootstrap\Html::activeHiddenInput($model, 'items[product_price_id][]', ['id' => false, 'class' => 'product_price_id']); ?>
    <?= \yii\bootstrap\Html::activeHiddenInput($model, 'items[qty][]', ['id' => false, 'class' => 'qty']); ?>
    </div>
</div>

public function validateItems()
{
    $productIdList = $this->items['product_id'];
    $qtyList = $this->items['qty'];
    $productPriceIds = $this->items['product_price_id'];

    foreach ($productIdList as $i => $product_id)
    {
        $price = null;
        $qty = $qtyList[$i];
        $product_price_id = $productPriceIds[$i];
        if(isset($product_price_id) && isset($qty) && $qty > 0)
        {
            $product = Product::findOne($product_id);
            if(null != $product && $product->isOnline())
            {
                if($product->isAreaPrice())
                {
                    if(!isset($item['product_price_id']))
                    {
                        $this->addError('items', '编号为'.$i.'的商品地区未选择。');
                    }
                    else
                    {
                        /** @var ProductPrice $pp */
                        $pp = ProductPrice::find()->where(['id' => $product_price_id, 'product_id' => $product_id])->one();
                        if(null != $pp)
                        {
                            $price = $pp->price;
                        }
                    }
                }
                else
                {
                    $price = $product->price;
                }
                $this->products[] = [
                    'product' => $product,
                    'qty' => (int)$qty,
                    'price' => $price
                ];
            }
            else
            {
                $this->addError('items', '编号为'.$i.'的商品信息不正确。');
            }
        }
        else
        {
            $this->addError('items', '编号为'.$i.'的商品信息不正确。');
        }
    }
}