It is first important to understand the two core concepts of ThinkPHP - model and controller. The model represents the data model of the application, and the controller represents the control logic of the application. To perform summation calculations, you need to import the corresponding model in the controller method and perform the summation operation.

Specifically, we can follow the following steps.

1. Create a new controller method to implement sum calculation. For example, define a new method named sum() in the relevant controller.

2. In the sum() method, introduce the data model that requires summation calculation. Generally speaking, we will search the model for data that needs to be summed, and then pass it to the controller for calculation.

3. The summation calculates the incoming data and returns the result to the view for display. In ThinkPHP, we can use arrays to return data results.

Next, let’s look at the specific implementation.

1. Create a new controller method

First, we need to define a new method in the controller. We can create a new controller file in the app/controller/ directory, such as Sum.php, and then define a sum() method in it for sum calculation.

namespace app\controller;

use app\model\DemoModel;

class Sum
{
    public function sum()
    {
        // 在這里進行求和計算
        return ['result' => $sum];
    }
}

2. Introduce the data model that needs to be calculated

In the sum() method, we need to import the data model that needs to be calculated. . Data models are often used to query data in a database. A model called DemoModel is defined, which is used to query the age information of the user named "Zhang San".

namespace app\model;

use think\Model;

class DemoModel extends Model
{
    protected $table = 'demo';

    public function getAgeByUserName($name)
    {
        return $this->where('name', $name)->value('age');
    }
}

We defined a method named getByUserName(age) in the Model class, which is used to obtain the user’s age information based on their name. In this example, we only query the age information of the user named "Zhang San".

3. Perform sum calculation on the passed in data

When we introduce the data model that requires sum calculation, we can calculate the input data are summed. In this example, we need to sum up the queried user age information.

namespace app\controller;

use app\model\DemoModel;

class Sum
{
    public function sum()
    {
        // 引入數(shù)據(jù)模型
        $demoModel = new DemoModel;

        // 查詢張三、李四、王五的年齡信息
        $zhangsan = $demoModel->getAgeByUserName('張三');
        $lisi = $demoModel->getAgeByUserName('李四');
        $wangwu = $demoModel->getAgeByUserName('王五');

        // 對年齡信息進行求和計算
        $sum = $zhangsan + $lisi + $wangwu;

        // 返回計算結(jié)果
        return ['result' => $sum];
    }
}

In this example, we use the DemoModel model to query the age information of users named "Zhang San", "Li Si", and "Wang Wu", and perform sum calculations. We finally return the calculation results to the view layer for display.

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