Backend Development
PHP Tutorial
How to implement an online second-hand trading platform in PHP?
How to implement an online second-hand trading platform in PHP?
With the continuous development of Internet technology, second-hand trading platforms have become a very popular market. In this market, people can buy second-hand goods they need in a simple and fast way, and they can also sell items they don’t need through this platform. Therefore, a reliable and easy-to-use second-hand trading platform will be extremely valuable. In this article, we will explore how to use PHP to create an online second-hand trading platform.
- Determine the functions and needs of the platform
Before we start writing code, we need to determine the functions and needs of the platform to better meet the needs of users. The following are some common functions:
- User registration and login: This is the most basic function, allowing users to register their own account on the platform and use this account to log in to the system.
- Product release: This function allows users to add product information they want to sell, including product name, price, description, photos, etc.
- Search and filter: This function allows users to search and filter suitable product information according to their own needs.
- Ordering and payment: This function allows users to place orders and pay online, which is convenient and fast.
- Evaluation and feedback: This function allows users to evaluate and provide feedback on the trading experience, increasing the transparency and credibility of the transaction.
- Database design
Before we start writing code, we need to design a suitable database to store and manage all the data on the platform. The following are some common data tables:
- User table: stores user registration information, login information, etc.
- Product table: stores product information, price, description, photos, etc.
- Order table: stores order information, product information, price, status, etc.
- Evaluation table: stores users’ evaluation and feedback on the trading experience.
- Writing PHP code
After determining the functions and requirements of the platform and designing the database, you can start writing PHP code. The following is the code to implement the basic functions of the platform:
- User registration and login:
In PHP, we can use MySQLi and PDO to connect to the database. The following is a code that uses MySQLi to add a user to the database:
<?php
// 连接数据库
$con = mysqli_connect("localhost", "username", "password", "database_name");
// 添加用户
$name = $_POST["name"];
$email = $_POST["email"];
$password = $_POST["password"];
$sql = "INSERT INTO users (name, email, password) VALUES('$name', '$email', '$password')";
mysqli_query($con, $sql);
?>In this code, we use the $_POST variable to get the data in the form and use the mysqli_query function to add data to the database.
- Product release:
The following is a code to add products to the database:
<?php
// 添加商品
$name = $_POST["name"];
$description = $_POST["description"];
$price = $_POST["price"];
$sql = "INSERT INTO products (name, description, price) VALUES('$name', '$description', '$price')";
mysqli_query($con, $sql);
?>In this code, we use something similar to adding a user Add product information to the database.
- Search and filter:
The following is a code that uses MySQLi to implement a basic search:
<?php
// 连接数据库
$con = mysqli_connect("localhost", "username", "password", "database_name");
// 搜索并显示商品
$search = $_GET["search"];
$sql = "SELECT * FROM products WHERE name LIKE '%$search%'";
$result = mysqli_query($con, $sql);
while ($row = mysqli_fetch_assoc($result)) {
echo $row["name"] . "<br>";
}
?>In this code, we use the $_GET variable Get the parameters in the URL and search for them using SQL's LIKE operator. At the same time, we use the mysqli_fetch_assoc function to obtain data from the query results and display it on the page.
- Place an order and pay:
The following is a simple code to purchase items:
<?php
// 连接数据库
$con = mysqli_connect("localhost", "username", "password", "database_name");
// 添加订单并更新库存
$product_id = $_GET["id"];
$user_id = $_SESSION["user_id"];
$sql = "INSERT INTO orders (product_id, user_id, status) VALUES('$product_id', '$user_id', 'pending')";
mysqli_query($con, $sql);
$sql = "UPDATE products SET stock = stock - 1 WHERE id = '$product_id'";
mysqli_query($con, $sql);
?>In this code, we first add an order to the orders table and decrease the inventory by 1.
- Ratings and feedback:
The following is a code to add a review:
<?php
// 添加评价
$product_id = $_POST["product_id"];
$user_id = $_POST["user_id"];
$rating = $_POST["rating"];
$comment = $_POST["comment"];
$sql = "INSERT INTO feedback (product_id, user_id, rating, comment) VALUES('$product_id', '$user_id', '$rating', '$comment')";
mysqli_query($con, $sql);
?>In this code, we use the $_POST variable to get the form data and add evaluation information to the evaluation table.
- Summary
In this article, we explored how to create an online second-hand trading platform using PHP. We identified the functionality and requirements of the platform, designed a suitable database, and wrote some basic PHP code. Of course, this is just a simple example, and more factors need to be considered in actual development, such as security, user experience, etc. We hope this article helped you understand how to develop a second-hand trading platform using PHP.
The above is the detailed content of How to implement an online second-hand trading platform in PHP?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
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
How to use PHP to build social sharing functions PHP sharing interface integration practice
Jul 25, 2025 pm 08:51 PM
The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.
How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization
Jul 25, 2025 pm 08:57 PM
To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X
PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy
Jul 25, 2025 pm 08:27 PM
1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.
PHP calls AI intelligent voice assistant PHP voice interaction system construction
Jul 25, 2025 pm 08:45 PM
User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.
PHP integrated AI intelligent picture recognition PHP visual content automatic labeling
Jul 25, 2025 pm 05:42 PM
The core idea of integrating AI visual understanding capabilities into PHP applications is to use the third-party AI visual service API, which is responsible for uploading images, sending requests, receiving and parsing JSON results, and storing tags into the database; 2. Automatic image tagging can significantly improve efficiency, enhance content searchability, optimize management and recommendation, and change visual content from "dead data" to "live data"; 3. Selecting AI services requires comprehensive judgments based on functional matching, accuracy, cost, ease of use, regional delay and data compliance, and it is recommended to start from general services such as Google CloudVision; 4. Common challenges include network timeout, key security, error processing, image format limitation, cost control, asynchronous processing requirements and AI recognition accuracy issues.
PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism
Jul 25, 2025 pm 08:30 PM
PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.
How to use PHP to combine AI to generate image. PHP automatically generates art works
Jul 25, 2025 pm 07:21 PM
PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.
How to use PHP to develop AI-driven advertising delivery PHP advertising performance optimization solution
Jul 25, 2025 pm 06:12 PM
PHP provides an input basis for AI models by collecting user data (such as browsing history, geographical location) and pre-processing; 2. Use curl or gRPC to connect with AI models to obtain click-through rate and conversion rate prediction results; 3. Dynamically adjust advertising display frequency, target population and other strategies based on predictions; 4. Test different advertising variants through A/B and record data, and combine statistical analysis to optimize the effect; 5. Use PHP to monitor traffic sources and user behaviors and integrate with third-party APIs such as GoogleAds to achieve automated delivery and continuous feedback optimization, ultimately improving CTR and CVR and reducing CPC, and fully implementing the closed loop of AI-driven advertising system.
