How to use PHP to implement the bus query function of WeChat applet?

How to use PHP to implement the bus query function of WeChat mini program?

With the popularity of smartphones, WeChat mini programs have become a very popular application form. WeChat applet can be used directly in WeChat without downloading and installation. It is easy to use and has rich functions. In the development of WeChat mini programs, the bus query function is a very common requirement. This article will introduce how to use PHP to implement the bus query function of the WeChat applet and provide specific code examples.

First, we need to register the mini program in the mini program developer backend and obtain the AppID and AppSecret of the mini program. These credentials will be used to initiate requests to the WeChat server.

We will use PHP's curl function to send HTTP requests and get the returned data. The following is an example of a function that sends a GET request:

function httpGet($url)
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_URL, $url);
    $res = curl_exec($curl);
    curl_close($curl);
    return $res;
}

Next, we need to obtain the access_token through the WeChat interface. access_token is the certificate for accessing the WeChat interface, and its validity period is 2 hours. We can obtain the access_token through the following code:

function getAccessToken($appid, $appsecret)
{
    $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";
    $res = httpGet($url);
    $json = json_decode($res);
    return $json->access_token;
}

After obtaining the access_token, we can obtain the bus route information through the WeChat interface. The following is an example of a function that obtains bus route information:

function getBusRoute($access_token, $city, $busline)
{
    $url = "https://api.weixin.qq.com/wxa/search_map_poi?type=bus&city=$city&keyword=$busline&access_token=$access_token";
    $res = httpGet($url);
    return $res;
}

$city and $busline in the above code represent the city name and bus line name respectively. By calling this function, we can get detailed information about the bus route.

Finally, we need to call the above function in the background page of the mini program and return the result to the front-end page. The following is a code example for implementing public transportation query through WeChat mini program cloud development:

Page({
  data: {
    city: '',
    busline: '',
    result: ''
  },
  inputCity: function(e) {
    this.setData({
      city: e.detail.value
    });
  },
  inputBusline: function(e) {
    this.setData({
      busline: e.detail.value
    });
  },
  searchBus: function() {
    wx.cloud.callFunction({
      name: 'getBusRoute',
      data: {
        city: this.data.city,
        busline: this.data.busline
      },
      success: res => {
        this.setData({
          result: res.result
        });
      },
      fail: err => {
        console.error('调用云函数失败', err)
      }
    })
  }
})

In the above code, we have defined three data bindings in the background page of the mini program, representing the input city name, Bus route names and search results. When the user completes the input and clicks the query button, the cloud function getBusRoute will be called and the city name and bus route name will be passed in as parameters. The query results will be displayed in the interface.

To sum up, we can use PHP to implement the bus query function of the WeChat applet. By obtaining the access_token and calling the WeChat interface, we can obtain the detailed information of the bus route and display it in the mini program. The above is a simple example, which may need to be modified and optimized according to specific needs in actual development.

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