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Tutorial on using PHP and Baidu Map API to display points of interest around the project

WBOYOriginal: 2023-07-31 13:46:531444browse

In today's Internet era, map navigation has become an indispensable part of people's lives. How to use maps to display surrounding points of interest (POI) in our project is also an important functional requirement. This article will take the use of PHP and Baidu Map API to display points of interest around the project as an example to introduce the specific implementation method in detail.

Step 1: Register a Baidu developer account and create an application

First, we need to register a developer account on the Baidu Maps Developer Platform. After the registration is completed, create an application in the console of Baidu Map Open Platform and obtain the corresponding API Key. This API Key will be used in subsequent development.

Step 2: Create a PHP file and introduce Baidu Map API

Next, we need to create a PHP file, such as poi.php, to display surrounding points of interest. In the poi.php file, we first need to introduce the relevant library files of Baidu Map API. The specific code example is as follows:

<?php
// 引入百度地图API
require_once 'BaiduMapAPI.php';
?>

In the code, we use the require_once function to introduce BaiduMapAPI.php, the main library file of Baidu Map API, into our project. This library file will provide the relevant functions and interfaces required by Baidu Maps.

Step 3: Write the front-end page and map display container

In the poi.php file, we need to write the code for the front-end page and map display container. The specific code example is as follows:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>项目周边兴趣点展示</title>
    <style type="text/css">
        /* 地图展示容器的样式 */
        #map-container{
            width: 100%;
            height: 500px;
        }
    </style>
</head>
<body>
    <div id="map-container"></div>
</body>
</html>

In this code, we create a simple HTML page, which contains a div element with the id "map-container" as the map display container. This container will be used to display map and point of interest information.

Step 4: Write back-end code to obtain and display points of interest

Now we can start writing back-end code to obtain and display information about surrounding points of interest through Baidu Map API. The specific code example is as follows:

<?php
// 引入百度地图API
require_once 'BaiduMapAPI.php';

// 获取经纬度
$longitude = $_GET['longitude'];
$latitude = $_GET['latitude'];

// 创建百度地图实例
$map = new BaiduMapAPI($api_key);

// 设置中心点位置
$map->setCenter($longitude, $latitude);

// 获取周边兴趣点
$poi_list = $map->getPOIList($longitude, $latitude);

// 输出兴趣点信息
foreach($poi_list as $poi){
    echo $poi['name'] . ' - ' . $poi['address'] . "<br>";
}
?>

In this code, we first obtain the latitude and longitude information passed by the front end. Then, by creating a Baidu map instance and setting the center point location, we can obtain information about surrounding points of interest by calling the getPOIList function. Finally, we output the names and addresses of the points of interest by looping over them.

Step 5: Use Ajax to obtain the geographical location and call the back-end code

Finally, we can use Ajax to obtain the user's geographical location information and pass this information to the back-end code to obtain Display of surrounding points of interest. The specific code example is as follows:

// 获取用户经纬度信息
navigator.geolocation.getCurrentPosition(function(position) {
    var longitude = position.coords.longitude;
    var latitude = position.coords.latitude;
    
    // 发送Ajax请求
    var xhr = new XMLHttpRequest();
    xhr.open("GET", "poi.php?longitude=" + longitude + "&latitude=" + latitude, true);
    xhr.onreadystatechange = function() {
        if (xhr.readyState === 4 && xhr.status === 200) {
            // 获取到兴趣点信息后，将其展示在页面上
            document.getElementById("map-container").innerHTML = xhr.responseText;
        }
    };
    xhr.send();
});

In this code, we use the navigator.geolocation.getCurrentPosition function to obtain the user's latitude and longitude information. Then, we carry the latitude and longitude information in the URL by creating an XMLHttpRequest object and sending a GET request. When the server returns the response, we can display the point of interest information on the page by setting the innerHTML attribute of the map-container element.

So far, we have completed the tutorial on using PHP and Baidu Map API to display points of interest around the project. By following the above steps, we can easily display surrounding points of interest in our projects to provide users with a better navigation and positioning experience. Hope this article is helpful to everyone!

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