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.
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:
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:
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:
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.
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.
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.
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.
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.
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.
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