Second-hand recycling website uses personal user authentication function developed in PHP

Second-hand recycling website uses the personal user identity verification function developed in PHP

With the development of the Internet, the second-hand trading industry has also developed rapidly, and people pay more attention to environmental protection and resource reuse. Therefore, second-hand recycling websites have gradually become popular among users. In order to ensure the security of transactions and the confidentiality of user information, the second-hand recycling website adopts the personal user identity verification function.

PHP is a scripting language widely used in web development. It is loved by many developers because of its ease of learning, ease of use and cross-platform nature. Below we will introduce the implementation method of using PHP to develop the personal user authentication function in the development of second-hand recycling website.

First, we need to create a PHP file to handle the logic related to user authentication. In this file, we can use the following code example:

<?php
// 获取用户提交的表单数据
$username = $_POST['username'];
$password = $_POST['password'];

// 连接数据库
$mysqli = new mysqli("localhost", "username", "password", "database_name");
if ($mysqli->connect_errno) {
    die("连接数据库失败: " . $mysqli->connect_error);
}

// 构造SQL查询语句
$sql = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
$result = $mysqli->query($sql);

if ($result->num_rows > 0) {
    // 用户名和密码验证成功，进行登录操作
    session_start();
    $_SESSION['username'] = $username;
    // 其他登录操作，如跳转到用户首页等
    echo "登录成功！";
} else {
    // 用户名和密码验证失败，返回错误信息
    echo "用户名或密码错误！";
}

// 关闭数据库连接
$mysqli->close();
?>

In the above example, we first get the form data submitted by the user, including the username and password. Then, we use mysqli to connect to the database and construct a SQL query statement to query whether the user name and password match. If they match, log in, otherwise an error message is returned. Note that in actual development, we should use password hashing algorithm to encrypt passwords to increase security.

Next, we also need to add an HTML form to the login page of the website for users to enter their username and password. The following is a simple HTML code example:

<form action="login.php" method="post">
    <label for="username">用户名：</label>
    <input type="text" id="username" name="username" required>
    <br>
    <label for="password">密码：</label>
    <input type="password" id="password" name="password" required>
    <br>
    <input type="submit" value="登录">
</form>

In the above example, we use an HTML form to receive user input and submit the entered username and password to the login.php file through the POST method. deal with.

By using the above sample code, the second-hand recycling website can realize the function of personal user identity verification. When the user enters the correct username and password, the system will return successful login information and save the user information in the session to facilitate subsequent operations. If the user name or password entered by the user is incorrect, the system will return the corresponding error message to remind the user to check the entered information.

In short, personal user identity verification is a crucial function in second-hand recycling websites, which can protect the security of user information and the reliability of website transactions. Through PHP and related web development technologies, we can quickly and easily implement this function and provide users with a better user experience.

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