Map navigation skills developed in PHP in WeChat mini program

With the continuous development of modern technology, mobile phones have become an indispensable item in people's lives. With the emergence of WeChat mini programs, their applications in life and business are becoming more and more common. Among them, the map navigation function of the WeChat applet has brought great convenience to people's travel. In the implementation of WeChat mini program map navigation, PHP technology is indispensable. Below I will share with you some map navigation skills developed in PHP in WeChat mini programs.

1. Obtaining the map API
Before developing the WeChat applet map navigation function, we need to obtain the map API first. Among the well-known map API providers in China, Tencent Maps, Amap and Baidu Maps are relatively famous. Different map API providers have different usage methods and API interfaces. While highlighting the overall style of their own mini-programs, developers can choose a suitable map API provider based on their own needs.

2. Obtaining latitude and longitude
In the map application, location information is displayed in the form of longitude and latitude. Therefore, we need to obtain the corresponding longitude and latitude based on the address or coordinates entered by the user. You can use a third-party API interface or write your own PHP code to obtain latitude and longitude information. The following is a sample code for obtaining longitude and latitude based on Baidu Map API:

function getlocation($city, $address){
    $url = "http://api.map.baidu.com/geocoder/v2/?address=".$address."&output=json&ak=百度地图API秘钥&city=".$city;
    $data = file_get_contents($url);
    $res = json_decode($data, true);
    if($res['status'] == 0){
        $location = $res['result']['location'];
        return $location;
    }
    return false;
}

3. Route planning
By obtaining the longitude and latitude of the user's current location and destination location, the route planning function can be realized. Different map API providers provide different route planning interfaces. However, generally speaking, the route planning process can be divided into the following three steps:

1. Obtain the longitude and latitude information of the user's current location and destination location;
2. Route planning provided through the map API Interface to obtain route information;
3. Display the obtained route information on the map.

4. Positioning function
In the WeChat mini program, the user’s location information is very important. Obtaining user location information requires the use of the API interface provided by WeChat developer tools. When you need to use the WeChat positioning function, you first need to authorize the location information. After the user agrees to authorize, we can obtain the user's current location information through the API provided by WeChat. The following is a sample code for positioning acquisition based on WeChat API:

wx.getLocation({
  type: 'wgs84',
  success: function (res) {
    var latitude = res.latitude
    var longitude = res.longitude
    var speed = res.speed
    var accuracy = res.accuracy
  }
})

5. Search for nearby locations
In addition to route planning and positioning functions, search for nearby locations is also a commonly used function in the map navigation function of WeChat mini-programs. When implementing nearby location search, we need to obtain the latitude and longitude information of the user's current location and obtain nearby location information through the search interface provided by the map API. The following is a sample code for nearby location search based on Tencent Map API:

function search($keyword, $location){
    $url = "https://apis.map.qq.com/ws/place/v1/search?keyword=".$keyword."&location=".$location."&key=腾讯地图API秘钥";
    $data = file_get_contents($url);
    $res = json_decode($data, true)
    if($res['status'] == 0){
        $address = array();
        foreach($res['data'] as $row){
            $addr = array(
                'name' => $row['title'],
                'address' => $row['address'],
                'lat' => $row['location']['lat'],
                'lng' => $row['location']['lng'],
            );
            array_push($address, $addr);
        }
        return $address;
    }
    return false;
}

The above is an introduction to the map navigation skills developed in PHP in the WeChat applet. I hope to be helpful.

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