Implement WeChat mall order management in PHP

With the development of e-commerce, more and more merchants choose to open their own malls on the WeChat platform. However, how to manage orders efficiently has become a problem faced by merchants.

As the most popular development language at present, PHP also performs very well in implementing WeChat mall order management. Next, this article will introduce how to implement WeChat mall order management in PHP.

First, we need to obtain the order information returned by WeChat payment. WeChat Pay sends order information to the developer's server through a callback mechanism, and developers need to write code in the server to process these order information. In PHP, you can use the $_POST global variable to obtain the POST data transmitted from the WeChat server.

Generally, developers need to obtain order information based on the order number returned by the WeChat server. In PHP, you can send a request to query the order to the WeChat server through the curl function, as shown below:

$url = "https://api.weixin.qq.com/pay/orderquery";
$data = array(
  'appid' => 'your_appid',
  'mch_id' => 'your_mch_id',
  'transaction_id' => 'your_transaction_id',
  'nonce_str' => 'your_nonce_str',
  'sign' => 'your_sign'
);
$data_xml = arrayToXml($data);
$res = http_post_data($url, $data_xml);
$res_obj = json_decode(json_encode(simplexml_load_string($res, 'SimpleXMLElement', LIBXML_NOCDATA)), true);

Among them, $data is the parameters we need to transmit to the WeChat server, including appid, mch_id, transaction_id, nonce_str and sign. These parameters can be obtained through the WeChat merchant platform. $data_xml is the data that converts $data into xml format. http_post_data is a function that uses the curl function to send a POST request to the WeChat server. The returned $res is the query result returned by the WeChat server.

After obtaining the order information, we need to store it in the database. In PHP, there are many excellent database operation libraries, such as PDO, mysqli and mysql, etc. Here we choose to use PDO to operate the database.

try {
  $pdo = new PDO('mysql:host=localhost;dbname=test', 'test', 'test');
  $sql = 'INSERT INTO order (out_trade_no, transaction_id, total_fee) VALUES (:out_trade_no, :transaction_id, :total_fee)';
  $stmt = $pdo->prepare($sql);
  $stmt->bindParam(':out_trade_no', $out_trade_no);
  $stmt->bindParam(':transaction_id', $transaction_id);
  $stmt->bindParam(':total_fee', $total_fee);
  $stmt->execute();
} catch (PDOException $e) {
  echo $e->getMessage();
}

The above code connects to the database through PDO and adds a new order information record in the database.

After the order information is stored, we need to implement management operations such as query, modification, and deletion of the order information. In PHP, you can use the MVC pattern to implement order management logic.

In MVC mode, M represents Model, V represents View, and C represents Controller. The Model is responsible for operating the database; the View is responsible for outputting the data generated by the back-end logic to the front-end page; the Controller is responsible for receiving the data submitted by the front-end form and performing corresponding operations in the database.

The following is an example of order management:

//model
class OrderModel {
  public function getOrder($out_trade_no) {
    //查询订单信息
  }
  public function updateOrder($out_trade_no, $data) {
    //更新订单信息
  }
  public function deleteOrder($out_trade_no) {
    //删除订单信息
  }
}

//view
class OrderView {
  public function showOrder($order) {
    //显示订单信息
  }
}

//controller
class OrderController {
  private $model;
  private $view;
  public function __construct($model, $view) {
    $this->model = $model;
    $this->view = $view;
  }
  public function getOrder($out_trade_no) {
    $order = $this->model->getOrder($out_trade_no);
    $this->view->showOrder($order);
  }
  public function updateOrder($out_trade_no, $data) {
    $this->model->updateOrder($out_trade_no, $data);
  }
  public function deleteOrder($out_trade_no) {
    $this->model->deleteOrder($out_trade_no);
  }
}

//route
$model = new OrderModel();
$view = new OrderView();
$controller = new OrderController($model, $view);
if(isset($_POST['out_trade_no'])) {
  $out_trade_no = $_POST['out_trade_no'];
  if(isset($_POST['action'])) {
    $action = $_POST['action'];
    if($action == 'update') {
      //修改订单信息
      $data = array(
        'transaction_id' => $_POST['transaction_id'],
        'total_fee' => $_POST['total_fee']
      );
      $controller->updateOrder($out_trade_no, $data);
    } else if($action == 'delete') {
      //删除订单信息
      $controller->deleteOrder($out_trade_no);
    } else {
      //查询订单信息
      $controller->getOrder($out_trade_no);
    }
  }
}

The above code encapsulates the logic of order management into different classes, and calls the corresponding operations through the Controller controller.

Finally, we need to display the order information on the front-end page. In PHP, you can use template engines such as Smarty to achieve this effect. Here we choose Smarty template engine.

require_once('/path/to/smarty/libs/Smarty.class.php');
$smarty = new Smarty();
$smarty->assign('order', $order);
$smarty->display('/path/to/template/index.tpl');

The above code assigns the order information to the Smarty template engine, and generates the front-end page through the Smarty template engine.

In summary, to implement WeChat mall order management in PHP, we need to complete the following steps:

1. Obtain the order information of WeChat callback;
2. The order information is stored in the database;
3. Implements management operations such as query, modification, and deletion of order information, and uses the MVC pattern to encapsulate them into different classes;
4. Display the order information to In the front-end page, you can use template engines such as Smarty to achieve this.

The above is all the content of implementing WeChat mall order management in PHP. I believe it will be helpful to developers who want to develop WeChat mall.

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