Tutorial on using PHP and Baidu Map API to implement taxi trajectory display function-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

Tutorial on using PHP and Baidu Map API to implement taxi trajectory display function

PHPz

Jul 31, 2023 pm 01:53 PM

php Baidu map java code Baidu map api Nearby location Bus stop information Taxi trajectory display

Tutorial on using PHP and Baidu Map API to implement the taxi trajectory display function

Abstract:
This tutorial will introduce how to use PHP and Baidu Map API to implement the taxi trajectory display function. We will use Baidu Maps' JavaScript API to draw the map and obtain taxi trajectory data from the database through PHP. Eventually, we will show the movement trajectory of each taxi and add some interactive features.

Preparation work
Before you start, you need to prepare the following work:
Install PHP and database (such as MySQL)
Register a Baidu Map developer account , and get the API key
Prepare taxi trajectory data
Create database
First, we need to create a database table to store the taxi trajectory data. Suppose we need to store the longitude, latitude and timestamp data of each taxi. Create a table named "tracks" and add the following fields:
```
CREATE TABLE `tracks` (
  `id` INT(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `car_id` INT(11) NOT NULL,
  `lng` DOUBLE NOT NULL,
  `lat` DOUBLE NOT NULL,
  `timestamp` INT(11) NOT NULL
);
```
Copy after login
Insert test data
Insert some test data into the database table created in the previous step for subsequent display trajectory. For example:
```
INSERT INTO `tracks` (`car_id`, `lng`, `lat`, `timestamp`) VALUES
(1, 116.404, 39.915, 1600000000),
(1, 116.406, 39.920, 1600000100),
...
```
Copy after login

Create a PHP script
Create a PHP script named "map.php" to obtain trajectory data from the database and return it to the front end. Add the following code to "map.php":

<?php
// 连接到数据库
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "your_database";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
 die("Connection failed: " . $conn->connect_error);
}

// 获取轨迹数据
$carId = $_GET['car_id']; // 从前端获取参数
$sql = "SELECT * FROM tracks WHERE car_id = $carId"; // 假设每辆出租车有一个唯一的ID
$result = $conn->query($sql);
$tracks = [];

if ($result->num_rows > 0) {
 while($row = $result->fetch_assoc()) {
     $tracks[] = $row;
 }
} else {
 echo "No tracks found.";
}

// 返回JSON格式的轨迹数据
header('Content-Type: application/json');
echo json_encode($tracks);
$conn->close();
?>

Copy after login

Create an HTML page
Create an HTML page named "index.html" to display map and trajectory data . Add the following code to "index.html":

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <title>出租车轨迹展示</title>
 <style>
     #map {
         width: 100%;
         height: 500px;
     }
 </style>
</head>
<body>
 <div id="map"></div>
 <script src="http://api.map.baidu.com/api?v=2.0&ak=your_api_key"></script>
 <script>
     var map = new BMap.Map("map");
     map.centerAndZoom(new BMap.Point(116.404, 39.915), 14);
     
     // 获取轨迹数据
     var carId = 1; // 假设需要展示的出租车ID为1
     var xhr = new XMLHttpRequest();
     xhr.open("GET", "map.php?car_id=" + carId, true);
     xhr.onreadystatechange = function () {
         if (xhr.readyState === 4 && xhr.status === 200) {
             var tracks = JSON.parse(xhr.responseText);
             // 绘制轨迹
             var path = tracks.map(function (track) {
                 return new BMap.Point(track.lng, track.lat);
             });
             var polyline = new BMap.Polyline(path, {strokeColor: "blue", strokeWeight: 3, strokeOpacity: 0.5});
             map.addOverlay(polyline);
         }
     };
     xhr.send();
 </script>
</body>
</html>

Copy after login

Run the example
Place the "map.php" and "index.html" files on your PHP server by browsing You can see the taxi trajectory display effect by accessing the "index.html" page.

Summary:
This tutorial introduces how to use PHP and Baidu Map API to implement the taxi trajectory display function. By using PHP to obtain trajectory data from the database, and using Baidu Maps' JavaScript API to draw maps and trajectories, we are able to dynamically display the movement trajectory of each taxi. You can further optimize and expand based on actual needs, such as adding taxi markers, real-time trajectory updates and other functions.

The above is the detailed content of Tutorial on using PHP and Baidu Map API to implement taxi trajectory display function. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

What's New in Windows 11 KB5054979 & How to Fix Update Issues

4 weeks ago By DDD

How to fix KB5055523 fails to install in Windows 11?

3 weeks ago By DDD

InZoi: How To Apply To School And University

1 months ago By DDD

How to fix KB5055518 fails to install in Windows 10?

3 weeks ago By DDD

Where to find the Site Office Key in Atomfall

4 weeks ago By DDD

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

7903

Java Tutorial

1652

CakePHP Tutorial

1411

Laravel Tutorial

1303

PHP Tutorial

1248

Related knowledge

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

See all articles