How to implement navigation map application in PHP?

With the development of the Internet, more and more people are beginning to use navigation map applications to plan their travel routes and find information about nearby businesses, attractions and other information. As a programming language widely used in Web development, PHP also has certain capabilities in implementing navigation map applications. This article will introduce how to implement navigation map applications in PHP.

1. Obtaining user location information
In navigation map applications, obtaining user location information is a very important step. We can obtain user location information through PHP's HTTP request. The specific implementation method is as follows:

1. Use JavaScript to locate the user's location and record the latitude and longitude:

navigator.geolocation.getCurrentPosition(function(position) {
  var lat = position.coords.latitude;
  var lng = position.coords.longitude;
  //将经纬度发给后端
});

2. After The client uses PHP to receive the latitude and longitude information:

$lat = $_POST['lat']; //获取经度
$lng = $_POST['lng']; //获取纬度

After obtaining the user's location information in this way, we can mark the user's location on the map to plan navigation.

2. Use third-party map API
To realize the navigation map application, you need to use the map API. Through the API, you can realize map display, labeling, path planning and other functions. Commonly used map APIs include Baidu Maps, Tencent Maps, Amap, etc. Here we take Baidu Map as an example to describe how to use the map API in PHP.

1. Introduce Baidu Map API:

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=YOUR_APP_KEY"></script>

Among them, YOUR_APP_KEY needs to be replaced with your own Baidu Map application AK. When applying for the Baidu Map application, an AK key will be generated for accessing the Baidu Map API.

2. Create a map instance:

//创建地图实例  
var map = new BMap.Map("container");  
//设置中心点  
var point = new BMap.Point(lng,lat);  
map.centerAndZoom(point, 15);  

3. Mark the location on the map:

//创建标注  
var marker = new BMap.Marker(point);  
//添加标注到地图中  
map.addOverlay(marker);  

4. Implement path planning:

Baidu Map provides three path planning methods: DrivingRoute, WalkingRoute, and RidingRoute. We can choose the corresponding method according to actual needs. For example, to implement walking path planning:

//创建步行路径规划实例  
var walking = new BMap.WalkingRoute(map, {renderOptions:{map: map, autoViewport: true}});  
//路线规划  
walking.search(startPoint, endPoint);  

3. Combine with database to query nearby businesses
Navigation map applications often need to combine databases to query nearby businesses to facilitate users to find information about surrounding businesses. Below we take the PHP language as an example to introduce how to implement this function in conjunction with the MySQL database.

1. Use MySQL database to store business information:

CREATE TABLE `shop` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL,
  `address` varchar(100) NOT NULL,
  `lng` double NOT NULL,
  `lat` double NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2. Query nearby businesses:

//查询距离当前位置10公里范围内的商家信息
$radius = 10; //搜索半径
$sql = "SELECT id, name, address, lng, lat, ROUND(6378.138 * 2 * ASIN(SQRT(POW(SIN(($lat * PI() / 180 - lat * PI() / 180) / 2),2) + COS($lat * PI() / 180) * COS(lat * PI() / 180) * POW(SIN(($lng * PI() / 180 - lng * PI() / 180) / 2),2)))) AS distance FROM shop WHERE lng BETWEEN ($lng-$radius/abs(cos(radians($lat))*111.2)) AND ($lng+$radius/abs(cos(radians($lat))*111.2)) AND lat BETWEEN ($lat-$radius/111.2) AND ($lat+$radius/111.2) HAVING distance <= $radius ORDER BY distance ASC";

In this SQL statement, $lat , $lng represents the user's latitude and longitude, and $radius represents the search radius. Calculate the distance between merchants and users based on longitude and latitude, and filter out merchant information within the search radius from the user.

The above is the basic process of implementing navigation map application in PHP. In the actual development process, you also need to pay attention to issues such as security, performance optimization, and code specifications. I hope this article can provide some reference and help for beginners.

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