Use PHP to implement WeChat applet login function

With the continuous development of the mobile Internet, WeChat mini programs have become an important channel for more and more enterprises and individuals to conduct business and services. The login function of the mini program is one of the key links in the development of the mini program. This article will introduce how to use PHP to implement the login function of WeChat applet.

1. Apply for a WeChat open platform account

Before we start developing WeChat mini programs, we need to apply for a WeChat open platform account and create our own mini program. The application process is relatively simple. For details, please refer to WeChat official documents.

2. Get the AppID and AppSecret of the Mini Program

After applying for an account on the WeChat Open Platform and creating the Mini Program, we need to obtain the AppID and AppSecret, the unique identifier of the Mini Program. These two parameters can be found on the "Development->Basic Configuration" page in the WeChat public platform and recorded for later use.

3. Build a PHP environment

We can choose to build a PHP environment locally or use a cloud server. This article takes building a PHP environment locally as an example. First, we need to download and install PHP software. It is recommended to use free and easy-to-use software such as XAMPP or WAMP. After the installation is complete, start the Apache and MySQL services.

4. Create MySQL database and data table

We need to create a user data table in the MySQL database to store the user's openid and other information. The following is a simple user data table creation statement:

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `openid` varchar(50) NOT NULL,
  `session_key` varchar(50) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

After creating the database and data table, we need to connect to the database in PHP code and write data insertion and query code.

5. Write PHP code

The following is the code to use PHP to implement the WeChat applet login function. Here, we use the curl library to send http requests to obtain user authorization information. After obtaining the user's openid and session_key, store them in the MySQL database.

$appId = 'your_appId';//填入小程序的AppID
$appSecret = 'your_appSecret';//填入小程序的AppSecret
$code = $_POST['code'];//获取小程序传过来的登录凭证code

//发送http请求，获取用户openid和session_key
$url = "https://api.weixin.qq.com/sns/jscode2session?appid={$appId}&secret={$appSecret}&js_code={$code}&grant_type=authorization_code";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
$output = curl_exec($ch);
curl_close($ch);
$info = json_decode($output, true);

//将用户openid和session_key存储在MySQL数据库中
$openid = $info['openid'];
$session_key = $info['session_key'];
$conn = mysqli_connect('localhost', 'root', 'password', 'database');
mysqli_query($conn, "insert into user(openid, session_key) values ('{$openid}', '{$session_key}')");

//返回用户openid，以便于小程序进行登录验证
echo $openid;

At this point, we have completed the process of using PHP to implement the WeChat applet login function. When the applet requests login, the user's login credential code is passed to the above PHP code. The PHP code obtains the user's authorization information through the curl library, stores it in the MySQL database, and returns the user's openid to facilitate the applet login. verify.

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