Sharing the implementation method of WeChat code scanning login function in PHP

Sharing how to implement the WeChat code scanning login function in PHP

With the rapid development of the mobile Internet, WeChat, as a widely used social software, has become an integral part of people's lives. In order to facilitate users to quickly log in to the website, many websites have introduced the WeChat code scanning login function. This article will introduce how to implement the WeChat code scanning login function in PHP and provide specific code examples.

1. Preparation work

Before implementing the WeChat code scanning login function, we need to do some preparation work first. First, you need a WeChat open platform account and create a new application. When creating an application, remember to enable the web page authorization login function and obtain the AppID and AppSecret of the application.

2. Generate a scan-code login link

First we need to generate a scan-code login link so that users can click to jump to the WeChat scan-code login page.

<?php

$redirect_uri = urlencode('http://yourdomain.com/callback.php');
$scope = 'snsapi_login';
$appid = 'your appid';

$login_url = 'https://open.weixin.qq.com/connect/qrconnect?appid=' . $appid . '&redirect_uri=' . $redirect_uri . '&response_type=code&scope=' . $scope . '#wechat_redirect';

echo '<a href="'.$login_url.'">使用微信扫码登录</a>';

?>

Among them, $redirect_uri is the callback link address after the user scans the QR code to log in, and needs to be replaced with your own website callback address. $scope is the authorization scope. Here we use snsapi_login to obtain the user's basic information. $appid is the AppID of the application you created on the WeChat open platform.

3. Processing the callback request

After the user scans the code to log in successfully, the WeChat server will send the authorization code (code) to the callback link address we set previously. Next we need to write a callback page (callback.php) to handle this request.

<?php

$code = $_GET['code'];
$appid = 'your appid';
$appsecret = 'your appsecret';

$url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $appid . '&secret=' . $appsecret . '&code=' . $code . '&grant_type=authorization_code';

$response = file_get_contents($url);
$data = json_decode($response, true);

$access_token = $data['access_token'];
$openid = $data['openid'];

// 这里可以根据openid查询数据库看用户是否已经注册等操作

?>

In the callback page, we first obtain the authorization code (code) returned by the WeChat server, and then send a request to the WeChat server, using the authorization code in exchange for access_token and openid. Finally, we can use openid to query the database to determine whether the user has been registered and complete the login logic processing.

Through the above sharing, you can implement the WeChat code scanning login function in PHP. Hope this article helps you!

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