EasyWeChat and PHP realize the user login function of WeChat applet

EasyWeChat is an open source WeChat SDK based on PHP, which simplifies the interaction process between developers and WeChat official accounts and mini programs. In this article, I will introduce how to use EasyWeChat and PHP to implement the user login function of WeChat applet, and attach a code sample.

First, we need to obtain the user's WeChat login credential code on the mini program. User login credentials can be obtained through the wx.login() interface of the mini program. The acquisition method is as follows:

wx.login({
  success: function (res) {
    if (res.code) {
      // 将code发送给后端服务器进行后续操作
    } else {
      console.log('登录失败！' + res.errMsg)
    }
  }
})

Next, we need to use PHP to implement the back-end login verification function. First, we need to introduce the automatic loading file and configuration file of EasyWeChat:

require_once 'vendor/autoload.php';

use EasyWeChatFactory;

$options = [
    'app_id' => 'your-app-id',
    'secret' => 'your-secret',
    'token' => 'your-token',
];

$app = Factory::miniProgram($options);

Among them, 'your-app-id', 'your-secret' and 'your-token' need to be replaced with the real mini program AppID , AppSecret and Token.

Next, we can use the auth->session() method provided by EasyWeChat to obtain the user's OpenID and Session Key. The code is as follows:

$code = $_GET['code'];

$result = $app->auth->session($code);

$openid = $result['openid'];
$sessionKey = $result['session_key'];

In this way, we successfully obtained the user's OpenID and Session Key. Next, we can save the user's OpenID to the database and generate a custom user identification token. The code example is as follows:

// 将用户OpenID保存到数据库中
// 这里使用PDO进行数据库操作，你也可以使用其他数据库操作方法
$pdo = new PDO('mysql:host=localhost;dbname=your-database', 'username', 'password');

$statement = $pdo->prepare('INSERT INTO users (openid) VALUES (:openid)');
$statement->execute([':openid' => $openid]);

// 生成用户标识token
$token = md5(uniqid(rand(), true));
$statement = $pdo->prepare('INSERT INTO tokens (openid, token) VALUES (:openid, :token)');
$statement->execute([':openid' => $openid, ':token' => $token]);

// 将token返回给小程序
echo json_encode(['token' => $token]);

In this way, we have successfully implemented the user login function of the WeChat applet. The applet can save the obtained token locally, and then send the token to the back-end server for verification every time an interface call for user authentication is required.

The above is a brief introduction and code example of using EasyWeChat and PHP to implement the user login function of WeChat applet. I hope to be helpful. If you have other questions, please leave a message for discussion.

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