PHP implementation of WeChat applet jump skills

With the promotion and popularity of WeChat mini programs, more and more companies and developers have begun to get involved in the development of WeChat mini programs. For beginners, there are still many skills that need to be learned in the development of WeChat mini programs. One of the important skills is how to use PHP to implement WeChat applet jump. This article will introduce the techniques for implementing WeChat applet jump in PHP.

1. Understand the basic process of jumping to the WeChat applet

Before introducing the implementation of jumping to the WeChat applet in PHP, let us first understand the basic process of jumping to the WeChat applet.

1. Jump from inside the WeChat applet to an external link

When a user clicks a link in the WeChat applet, the WeChat applet will first determine whether the link is an external link. If it is an external link, the WeChat applet will first jump to a transfer page and then jump to the target link.

2. Jump from the external link to the internal page of the WeChat applet

When the user clicks the WeChat applet link in the external browser, WeChat will directly open the WeChat applet and jump Go to the corresponding page.

Now that we understand the basic process of jumping to WeChat applet, let’s introduce how to use PHP to implement jumping to WeChat applet.

2. Use PHP to implement WeChat applet jump

The following is the code for PHP to implement WeChat applet jump:

<?php
//定义小程序appid和appsecret
$appid = '**********';
$appsecret = '**********';

//获取access_token
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appid."&secret=".$appsecret;
$result = file_get_contents($url);
$json_result = json_decode($result, true);
$access_token = $json_result['access_token'];

//拼接跳转链接
$redirect_uri = urlencode('https://www.example.com');
$url = "https://mp.weixin.qq.com/cgi-bin/componentloginpage?component_appid=".$appid."&pre_auth_code=".$pre_auth_code."&redirect_uri=".$redirect_uri;

//跳转到微信小程序授权页面
header("Location:" . $url);
exit;
?>

1. Define the applet appid and appsecret

First you need to define the appid and appsecret variables of the applet in the code. It should be noted that the appid here refers to the client ID of the mini program, not the appid of the open platform, because we need to obtain the access_token through the API of the mini program.

2. Obtain access_token

To obtain access_token, you need to send a GET request to the WeChat applet API. We can use the file_get_contents function to send a GET request. The WeChat applet API will return a JSON string containing access_token. We can use the json_decode function to convert the result into an array.

3. Splicing the jump link

Before splicing the jump link, we need to obtain the pre-authorization code pre_auth_code. To obtain the pre-authorization code, you can use the API of the WeChat applet. The pre-authorization code is a temporary ticket, valid for 10 minutes, and each pre-authorization code can only be used once.

After obtaining the pre-authorization code, you can splice the jump link. The jump link needs to contain the following parameters: component_appid, pre_auth_code and redirect_uri. Among them, component_appid is the appid of the third-party platform, pre_auth_code is the pre-authorization code, and redirect_uri is the external link.

4. Jump to the WeChat Mini Program authorization page

The last step is to jump the user to the WeChat Mini Program authorization page. You can use the header function to redirect the user to the authorization page. It should be noted that since the WeChat applet authorization page uses the HTTPS protocol, the HTTPS protocol must be used to redirect users to the authorization page.

3. Summary

PHP can help developers realize WeChat applet jump. This process requires the use of WeChat applet API and pre-authorization code mechanism. Proficient application of PHP skills can greatly improve development efficiency and simplify code writing when a large number of links jump. Although it is a bit complicated to use PHP to jump to the WeChat applet, as long as you follow the steps we have introduced, you can easily realize the function of jumping to the WeChat applet.

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