How to use PHP to implement WeChat code scanning login function

With the rapid development of mobile Internet, WeChat, as an important social tool, has gradually become an indispensable part of people's daily lives. In many websites and applications, the WeChat login function has become a trend, because it allows users to log in directly using their existing WeChat account, without the need to create a new account, and it also provides a more convenient and secure Login Method. This article will introduce how to use PHP to implement the WeChat code scanning login function.

1. Preparation work

Before starting to implement the WeChat code scanning login function, we need to ensure the following points:

1. Prepare a Registered WeChat official account and developer account. You need to register and authenticate on the WeChat public platform and obtain your own developer account.

2. Download and install the PHP SDK. We can install it through Composer, which requires the following packages:

• ##wechat/wechat

• overtrue/socialite

3. Obtain the AppID and AppSecret through the WeChat public platform for use in API calls. At the same time, you also need to configure the OAuth2.0 webpage of the public account. Authorized domain name.

2. Implementation steps

1. Create an authorization link

The most important step in the implementation of WeChat scan code login is when the user clicks the login button When doing so, an authorization link needs to be generated. Through this link, users can open it in WeChat and agree to authorize our application to access their WeChat account information.

We can use the OAuth2.0 protocol to implement user authorization. The code to generate the authorization link is as follows:

$socialite = $app->make('overtrue\socialite\Factory');
$oauth = $socialite->driver('wechat')->setRedirectUrl($redirectUrl);
return $oauth->redirect();

Among them, $redirectUrl is the URL redirected after authorization, and $app is Symfony's ServiceContainer object.

The generated URL is similar to the following:

https://open.weixin.qq.com/connect/oauth2/authorize?appid=<appid>&redirect_uri=<redirect_uri>&response_type=code&scope=snsapi_login&state=<state>#wechat_redirect</state></redirect_uri></appid>

Where, is our application ID, is the URL to be redirected after authorization, Is a random string of no more than 128 characters, used to prevent CSRF attacks.

2. Obtain the authorization token

When the user clicks the authorization link, he will enter the WeChat code scanning page. The user uses the WeChat code scanning tool to scan the code to log in, and then WeChat will redirect to The redirect URL we set in the first step comes with an Authorization Code.

We need to use this Code in exchange for AccessToken and RefreshToken. The code is as follows:

$socialite = $app->make('overtrue\socialite\Factory');
$oauth = $socialite->driver('wechat');
$user = $oauth->user();

$accessToken = $user->getToken()->access_token; //获取Access Token
$refreshToken = $user->getToken()->refresh_token; //获取Refresh Token
$openid = $user->getId(); //获取用户 OpenID

After using the SDK to obtain AccessToken and RefreshToken, we can use AccessToken to request basic user information in future visits, and we need to use RefreshToken to update AccessToken.

3. Request the user’s basic information

Use the obtained AccessToken and OpenID, and pass them as parameters when accessing the user’s basic information. The code is as follows:

$client = $app['wechat'];
$user = $client->user->get($openid);

Among them, $app is the ServiceContainer object of Symfony, and $client is the instance object created through the SDK.

Next, you can use the $user object to access the user's basic information, including nickname, gender, region, avatar URL, etc.

3. Summary

This article introduces how to use PHP to implement the WeChat code scanning login function. It is mainly divided into three steps: generating authorization links, obtaining authorization tokens and Request basic user information. During the implementation process, you need to pay attention to many details, such as how to obtain the AppID and AppSecret, how to configure the OAuth2.0 web page authorization domain name of the WeChat official account, how to use the SDK, etc. Through the introduction of this article, I believe that everyone has been able to master the basic implementation method of WeChat scan code login. You can add this function to your own website or application to provide a more convenient and secure login method and bring a better user experience to users. .

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