Client session management of small programs developed using PHP

Using PHP to develop client session management of small programs

In today's Internet era, small programs have become the preferred development method for more and more enterprises and individuals. In order to ensure the normal operation of the mini program, client session management is particularly important. This article will introduce how to use PHP to develop client session management of small programs and provide corresponding code samples for reference.

1. The importance of session management

Client session management refers to the process of establishing and maintaining session status between the applet and the server. Through session management, the mini program can save the user's identity, permissions and other information on the server side to facilitate subsequent operations and verification. At the same time, session management can also solve problems such as user login and user status maintenance in mini programs, improving user experience.

2. Use PHP to implement client session management

1. Create session

First, we need to obtain the user’s unique identifier when logging in to the mini program openid and send it to the server side. The server side saves this information into the session through PHP code and generates a unique session_id as the session identifier. The following is a simple sample code:

<?php
session_start(); // 开启会话

if($_POST['openid']){
  $_SESSION['openid'] = $_POST['openid']; // 保存openid到会话
  $_SESSION['session_id'] = uniqid(); // 生成会话标识
  // 其他操作...

  $data = array(
    'session_id' => $_SESSION['session_id']
  );
  echo json_encode($data); // 返回会话标识给小程序
}
?>

2. Verify session

In other requests of the applet, we need to verify the validity of the session to ensure that only logged in Only users can perform relevant operations. Here is a simple sample code:

<?php
session_start(); // 开启会话

if($_SESSION['session_id'] != $_POST['session_id']){
  $data = array(
    'code' => -1,
    'message' => '会话已过期'
  );
  echo json_encode($data); // 会话过期，返回错误信息
  exit;
}

// 其他操作...
?>

3. Destroy session

When the user logs out or the session expires, we need to destroy the session to release resources. The following is a simple sample code:

<?php
session_start(); // 开启会话

session_unset(); // 清空会话
session_destroy(); // 销毁会话
?>

3. Use of the mini program

In the mini program, we can initiate a network request by calling the wx.request() function and send the openid to Session management is performed on the server side. An example is as follows:

wx.login({
  success: function(res) {
    if (res.code) {
      // 发起网络请求，传递openid
      wx.request({
        url: 'https://example.com/login.php',
        method: 'POST',
        data: {
          openid: res.code
        },
        success: function(res) {
          // 获取到session_id，保存到本地
          wx.setStorageSync('session_id', res.data.session_id);
        }
      });
    } else {
      console.log('登录失败！' + res.errMsg)
    }
  }
});

// 在其他请求中验证会话
wx.request({
  url: 'https://example.com/verify.php',
  method: 'POST',
  data: {
    session_id: wx.getStorageSync('session_id')
  },
  success: function(res) {
    if (res.data.code == -1) {
      // 会话过期，处理相应逻辑
    } else {
      // 会话有效，继续其他操作
    }
  }
});

// 登出操作
wx.request({
  url: 'https://example.com/logout.php',
  method: 'POST',
  success: function(res) {
    // 清空本地保存的session_id
    wx.removeStorageSync('session_id');
  }
});

4. Summary

Through the above introduction, we have learned how to use PHP to develop client session management of small programs. Properly managing session states can ensure the normal operation of mini programs and improve user experience. I hope this article is helpful to you, and welcome your corrections and criticisms.

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