How to use PHP to implement the projection function of WeChat applet?

How to use PHP to implement the projection function of WeChat applet?

With the rapid development of WeChat mini programs, more and more developers are beginning to pay attention to the expansion and expansion of their functions. Among them, the projection function is a popular feature among users. Through the projection function, users can project the content on the mini program to a larger screen, providing a better visual experience. This article will introduce how to use PHP to implement the projection function of WeChat applet and provide corresponding code examples.

1. Preparation work

Before you start using PHP to implement the projection function of the WeChat applet, you need to do some preparation work. First of all, you need to have certain basic knowledge of PHP and be familiar with WeChat development-related knowledge. Secondly, you need to ensure that you already have a server that can implement the mini program projection function, such as building a PHP web server. Finally, you need to obtain the developer rights of the WeChat applet and obtain the corresponding AppID and AppSecret.

2. Implementation process

(1) Obtain the access_token of the mini program through PHP

Before using the API interface of the WeChat mini program, you need to obtain it first The access_token of the applet. access_token is an access token used to access and call the interface of the applet.

First, you need to use the following PHP code to obtain the access_token from the WeChat server:

<?php
  $appId = "你的AppID";
  $appSecret = "你的AppSecret";
  $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appId."&secret=".$appSecret;
  $result = file_get_contents($url);
  $result = json_decode($result, true);
  $access_token = $result["access_token"];
?>

This code will send a request to obtain the access_token to the WeChat server and parse the returned result into an array , extract access_token from it.

(2) Use PHP to call the projection function of the WeChat applet

After you have obtained the access_token, you can use PHP to call the API interface of the WeChat applet and implement the projection function .

The following is a sample code that uses PHP to implement the WeChat applet projection function:

<?php
  $appId = "你的AppID";
  $openId = "用户的OpenID";
  $access_token = "你的access_token";
  $content = "需要投影的内容";
  
  $url = "https://api.weixin.qq.com/wxa/devplugin?access_token=".$access_token;
  $data = array(
      "action" => "open",
      "plugin_appid" => $appId,
      "openid" => $openId,
      "content" => $content
  );
  $data = json_encode($data);
  
  $curl = curl_init();
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_POST, 1);
  curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
  $result = curl_exec($curl);
  curl_close($curl);
  
  $result = json_decode($result, true);
  if ($result["errmsg"] == "ok") {
      echo "投影成功！";
  } else {
      echo "投影失败！";
  }
?>

In the above code, you need to fill in the appId, openId, access_token and content fields with the corresponding values. Among them, appId represents the AppID of your mini program, openId represents the user's OpenID, access_token represents the access_token obtained in the previous step, and content represents the content that needs to be projected.

3. Summary

Through the above steps, we can use PHP to implement the projection function of the WeChat applet. First, we obtain the access_token of the mini program, and then use PHP to call the API interface of the WeChat mini program and implement the projection function. Of course, during the actual development process, you may also need to perform some other operations, such as obtaining the user's OpenID, etc. The specific implementation details can be adjusted and expanded according to actual needs. I hope this article will help you understand and use PHP to implement the projection function of WeChat applet!

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