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How to create a map application using PHP and Amap API

王林

May 11, 2023 am 09:09 AM

phpGaode map apiApplication creation

With the popularity of smartphones and mobile Internet, map applications are becoming more and more popular. If you want to create your own map application, PHP and Amap API are a good choice. In this article, we will introduce how to create a map application using PHP and Amap API.

Preparation

Before you start, you need to register an Amap developer account and create an application. This can be done in the Amap Developer Center. Once you've signed up, you'll get an API key that you need to use for every request.

Get to know the Amap API

The Amap API is a RESTful API. You can initiate a request to the server through the HTTP protocol and get a response from the server. Amap API provides many interfaces, such as geocoding, reverse geocoding, route planning, etc., which you can choose to use according to the application scenario.

The following is an introduction to some common interfaces:

Geocoding: parse the address into latitude and longitude coordinates.
Reverse geocoding: parse latitude and longitude coordinates into address information.
Path planning: Plan the optimal path between two points.
Surrounding search: Search for POI information around the specified location.

Integrate the Amap API into a PHP application

In a PHP application, you can use the curl library to initiate a request to the Amap API server, And get the response result in JSON format. The following is a sample code:

<?php
//将API密钥替换为您自己的
$apiKey = "your_api_key";
//需要查询的地址
$address = "北京市海淀区中关村南大街27号";
//构建请求URL
$url = "https://restapi.amap.com/v3/geocode/geo?key={$apiKey}&address={$address}";
//发起请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
curl_close($ch);
//解析响应
$json = json_decode($result);
$location = $json->geocodes[0]->location;
echo $location;
?>

The above code parses No. 27, Zhongguancun South Street, Haidian District, Beijing into longitude and latitude coordinates, and outputs the result. You can encapsulate it into a function for reuse in your application.

Display map

Before displaying the latitude and longitude coordinates on the map, you need to download the JavaScript API that introduces Amap and create a map container. Here is a sample code:

<!DOCTYPE html>
<html>
<head>
  <script src="//webapi.amap.com/maps?v=1.4.15&key=your_api_key"></script>
  <style type="text/css">
    #map-container {
      width: 100%;
      height: 400px;
    }
  </style>
</head>
<body>
  <div id="map-container"></div>
  <script>
    var map = new AMap.Map('map-container', {
      center: [116.397428, 39.90923],
      zoom: 10
    });
    var marker = new AMap.Marker({
      position: [116.397428, 39.90923],
      map: map
    });
  </script>
</body>
</html>

The above code creates a map container and adds a marker to the map. You can encapsulate it into a function for reuse in your application.

Combining Amap API and PHP

Now we will combine the above two sample codes to create a map application with more complete functions. In this application, users can enter the address in the text box and click the submit button to parse the address into latitude and longitude coordinates and display them on the map.

Here is the code for the application:

<!DOCTYPE html>
<html>
<head>
  <script src="//webapi.amap.com/maps?v=1.4.15&key=your_api_key"></script>
  <style type="text/css">
    #map-container {
      width: 100%;
      height: 400px;
    }
  </style>
</head>
<body>
  <form method="post" action="#">
    <input type="text" name="address" />
    <button type="submit" name="submit">提交</button>
  </form>
  <div id="map-container"></div>
  <?php
  if (isset($_POST['submit'])) {
    $address = $_POST['address'];
    $apiKey = "your_api_key";
    $url = "https://restapi.amap.com/v3/geocode/geo?key={$apiKey}&address={$address}";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $result = curl_exec($ch);
    curl_close($ch);
    $json = json_decode($result);
    $location = $json->geocodes[0]->location;
  ?>
  <script>
    var map = new AMap.Map('map-container', {
      center: [<?php echo $location ?>],
      zoom: 15
    });
    var marker = new AMap.Marker({
      position: [<?php echo $location ?>],
      map: map
    });
  </script>
  <?php
  }
  ?>
</body>
</html>

The above code adds a text box and a submit button to the page. When the user clicks the submit button, the map will reload on the same page and display the latitude and longitude coordinates for the address entered by the user.

In this application, we only use a small part of the functions of the Amap API. You can choose the appropriate interface to complete the application based on the application scenario. At the same time, more complex applications can be implemented by passing data between PHP and JavaScript.

Summary

In this article, we introduced how to create a map application using PHP and Amap API. By studying this article, you have mastered some basic skills on how to use the Amap API and integrate them into PHP applications.

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