How to use PHP arrays to implement user login and permission management functions

How to use PHP arrays to implement user login and permission management functions

User login and permission management are one of the very important functions when developing a website. User login allows us to authenticate users and protect the security of the website. Permission management can control users' operating permissions on the website to ensure that users can only access the functions for which they are authorized.

In this article, we will introduce how to use PHP arrays to implement user login and permission management functions. We'll use a simple example to demonstrate this process.

First, we need to create a user table to store user information. In this form, we need to record the user's username, password, permissions and other information. For simplicity, we will use a two-dimensional array to represent the user table. Each row represents a user, and each column represents the user's attributes.

$users = [
    ['username' => 'admin', 'password' => 'admin123', 'role' => 'admin'],
    ['username' => 'guest', 'password' => 'guest123', 'role' => 'guest'],
    ['username' => 'user', 'password' => 'user123', 'role' => 'user']
];

Next, we need to implement the user login function. Users log in by entering their username and password, and we will match the entered information with the data in the user form. If the match is successful, the login is successful; if the match fails, the login is failed.

function login($username, $password, $users) {
    foreach ($users as $user) {
        if ($user['username'] === $username && $user['password'] === $password) {
            return true;
        }
    }
    return false;
}

// Example usage
if (login('admin', 'admin123', $users)) {
    echo 'Login successful!';
} else {
    echo 'Login failed!';
}

In the above code, we define a login function, which accepts user name, password and user form as parameters, and returns a Boolean value indicating whether the login is successful. In the function, we use a foreach loop to iterate through each row in the user table and match it with the entered username and password. Returns true if a matching user is found, false otherwise.

Finally, we need to implement the permission management function. We will set a role attribute for each user to indicate the user's permission level. We can restrict users' access to certain functions based on their roles.

function hasPermission($username, $permission, $users) {
    foreach ($users as $user) {
        if ($user['username'] === $username && $user['role'] === $permission) {
            return true;
        }
    }
    return false;
}

// Example usage
if (hasPermission('admin', 'admin', $users)) {
    echo 'You have admin privileges!';
} else {
    echo 'You do not have admin privileges!';
}

In the above code, we define a hasPermission function, which accepts the user name, permission level and user form as parameters, and returns a Boolean value indicating whether the user has the permission. In the function, we use a foreach loop to iterate through each row in the user table and match it with the entered user name and permission level. Returns true if a matching user is found, false otherwise.

Through the above sample code, we can see how to use PHP arrays to implement user login and permission management functions. Of course, in actual development, we usually use a database to store user information and permission data. In this way, we can manage and operate more conveniently. However, the entire process can be demonstrated more easily using a PHP array as an example.

To sum up, user login and permission management are one of the key functions of building a secure website. These functions can be implemented simply and effectively using PHP arrays. By creating user tables and implementing login and permission judgment functions, we can easily implement user login and permission management functions. Hope this article helps you!

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