How to perform sum operation in ThinkPHP template

ThinkPHP is a lightweight PHP development framework that integrates a large number of excellent components and functions, which can greatly improve development efficiency. The template engine in the ThinkPHP framework is very flexible and scalable and can easily perform various operations, including sums and other operations.

In the ThinkPHP framework, the sum operation is usually used in templates. For example, when displaying an order list and you need to calculate the total order amount, you can use the sum operation. Next, we introduce how to perform sum operations in ThinkPHP templates.

First, we need to obtain the data that needs to be summed in the PHP code, and then pass the data to the template. Suppose we need to calculate the total order amount in the order list, we can use the following code:

// 获取订单列表
$orderList = Db::name('order')->select();

// 计算订单总金额
$totalAmount = 0;
foreach ($orderList as $order) {
    $totalAmount += $order['amount'];
}

// 将数据传递给模板
$this->assign('orderList', $orderList);
$this->assign('totalAmount', $totalAmount);

In the above code, we first use Db::name('order')->select( ) method to obtain the order list data, and then use the foreach loop to traverse the order list, accumulate the amount of each order, and finally get the total amount of the order. Then pass both the order list and the order total amount to the template.

Next, perform the summation operation in the template. In the ThinkPHP template, we can use the volist tag to traverse the data, and then use the sum attribute to perform a sum operation on the specified fields. The code is as follows:

<!-- 订单列表 -->
<table>
    <thead>
        <tr>
            <th>订单编号</th>
            <th>订单金额</th>
        </tr>
    </thead>
    <tbody>
        <!-- 遍历订单列表 -->
        <volist name="orderList" id="order">
            <tr>
                <td>{$order.order_no}</td>
                <td>{$order.amount}</td>
            </tr>
        </volist>
        <!-- 计算总金额 -->
        <tr>
            <td>总金额：</td>
            <td>{$orderList|sum='amount'}</td>
        </tr>
    </tbody>
</table>

In the above code, we use the volist tag to traverse the order list, and then display the order number and order amount in the table respectively. At the bottom of the table, we use the sum attribute to sum the amount field in the orderList variable, so that we can get the total amount of the order.

Summary: It is very simple to perform template sum operation in ThinkPHP. You only need to calculate the data in the PHP code, and then pass the data to the template. You can easily use the sum attribute. Sum operation.

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