How to implement WeChat applet search function in PHP

With the rapid popularity of WeChat mini programs in the market, more and more companies and developers have begun to invest in the research and development of mini programs. Among them, the search function has become a very important part of the mini program. In this article, we will introduce how to use PHP language to implement the search function of WeChat applet.

First of all, let us understand the principle of the search function of WeChat applet. The search of WeChat mini programs is implemented based on the open interface provided by WeChat public platform. Therefore, we need to create a mini program on the WeChat public platform and obtain the AppID and AppSecret of the mini program in order to use the WeChat open interface.

Next, we need to write PHP code to interact with the WeChat open interface to implement the mini program search function. The implementation steps are as follows:

1. Obtain the access_token of the applet in WeChat developer tools

Simulate the HTTP request through the curl function in PHP, initiate a request to the WeChat open interface, and obtain the access_token. The request address to obtain access_token is:

https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

Among them, APPID and APPSECRET are the AppID and AppSecret assigned when we create the mini program on the WeChat public platform. After obtaining the access_token, we can save it locally for subsequent calls.

2. Search for mini programs

After obtaining the access_token, we can implement the search function of the mini program through the WeChat open interface. The search request address is:

https://api.weixin.qq.com/wxa/search/wxaapi_submitpages?access_token=ACCESS_TOKEN

Among them, ACCESS_TOKEN is the access_token obtained in the previous step. We need to pass the following parameters to this interface:

{
  "query":"搜索关键字",
  "page":0,
  "num":10
}

Among them, query is the search keyword, page is the current page number (starting from 0), and num is the number of entries displayed on each page. The data returned by the interface includes information such as the name of the applet, the logo of the applet, and the description of the applet.

3. Return the search results to the applet

In PHP, we can encapsulate the search results into JSON format and return them to the applet. The format of the search results is as follows:

{
    "success": true/false,
    "msg": "成功/失败",
    "data": [
        {
          "name": "小程序名称",
          "logoUrl": "小程序logo地址",
          "description": "小程序描述",
          "path": "小程序路径"
        }
    ]
}

Among them, success indicates whether the search is successful, msg indicates the specific information of the search results, and data indicates the search result array.

To sum up, through the above steps, we can use PHP to implement the search function of WeChat applet. Of course, in order to ensure the accuracy and speed of search results, we also need to establish an efficient communication protocol between the mini program and the backend server. If you are interested in this, you can learn more about WeChat applet and PHP language.

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