Real-time positioning using PHP in WeChat mini program

With the development of mobile Internet, many applications require real-time positioning functions. WeChat mini program is currently one of the most popular mobile applications. Therefore, how to implement real-time positioning function in WeChat mini program has become the focus of developers.

This article will introduce how to use PHP language to implement real-time positioning function in WeChat applet. The following are the specific steps:

Step 1: Create a mini program application

First, we need to create a WeChat mini program application. After registering an account on the WeChat public platform, you can create a mini program application through the mini program development tool. After successful creation, we need to obtain the AppID and AppSecret of the mini program in the background management of the mini program. These two pieces of information will be used to interact with the WeChat server.

Step 2: Introduce necessary library files

In order to easily implement the real-time positioning function, we need to introduce some necessary library files. In this example, we use the PHP language, so we need to install the PHP SDK and the SDK of the WeChat open platform. After the installation is complete, we can call the relevant functions in PHP.

Step 3: Implement the positioning function

Before implementing the positioning function, we need to understand some basic knowledge about interacting with the WeChat server. The WeChat server uses the HTTPS protocol, the data format is JSON format, and both requests and responses are in POST mode.

When implementing the positioning function, we need to use the API interface provided by the WeChat applet, including wx.getLocation() and wx.request(). wx.getLocation() is used to obtain the user's current geographical location information, while wx.request() is used to send requests to the server and receive responses.

The PHP code is as follows:

<?php
$appid = "你的小程序appid";
$secret = "你的小程序appsecret";
$js_code = $_POST['code'];
$url = "https://api.weixin.qq.com/sns/jscode2session?appid={$appid}&secret={$secret}&js_code={$js_code}&grant_type=authorization_code";
$res = json_decode(file_get_contents($url), true);
$sessionKey = $res['session_key'];
$encryptedData = $_POST['encryptedData'];
$iv = $_POST['iv'];
$wxid=$_POST['wxid'];

include_once "wxBizDataCrypt.php";
$pc = new WXBizDataCrypt($appid, $sessionKey);
$errCode = $pc->decryptData($encryptedData, $iv, $data );

$array=get_object_vars(json_decode($data));
$location = $array['location'];
$latitude = $location['latitude'];
$longitude = $location['longitude'];
$accuracy=$location['accuracy'];
$time=$array['time'];
?>

In the above code, we first obtain the AppID and AppSecret of the mini program, and then obtain the user's code value through wx.login().

After obtaining the code value, we can obtain the user's openid and sessionkey through the WeChat interface. Next, we obtain the encrypted data sent by the applet and perform the decryption operation. After decryption is completed, we can obtain the user's geographical location information, including the user's latitude, longitude, accuracy, time and other information.

Step 4: Save the positioning information

The last step is to save the positioning information. Before this, we need to store the positioning information in the database so that it can be queried at any time. In this example, we choose to use MySQL as the database. The following is the code to save the positioning information:

<?php
$dbhost = "localhost";
$dbuser = "root";
$dbpawd = "";
$dbname = "weiyi";
$conn = mysqli_connect($dbhost, $dbuser, $dbpawd, $dbname);
if (!$conn) {
  die("连接失败: " . mysqli_connect_error());
}
$sql = "INSERT INTO user_location (wxid, latitude, longitude, accuracy, time)
VALUES ('{$wxid}', {$latitude}, {$longitude}, {$accuracy}, {$time})";
if (mysqli_query($conn, $sql)) {
  echo "记录已添加到数据库中";
} else {
  echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
mysqli_close($conn);
?>

In the above code, we store the obtained positioning information into the user_location table, including the user's WeChat ID, latitude, longitude, accuracy and time. After the storage is completed, we can query the user's positioning information at any time to achieve real-time positioning.

To sum up, it is not difficult to implement the real-time positioning function in the WeChat applet. We only need to write relevant code using PHP language. Through the above steps, you can easily implement the real-time positioning function in the WeChat applet.

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