Development practice of PHP MySQL user permission control

PHP Development Practice: Using PHP and MySQL to Implement User Permission Control

With the development of the Internet, more and more websites and applications need to implement user permission control functions to ensure that users can only access them Authorized resources. As a widely used server-side programming language, PHP provides a wealth of tools and functions to implement user permission control. Combined with the MySQL database, we can quickly build a flexible and secure permission control system.

In this article, we will introduce how to use PHP and MySQL to implement user permission control. We will proceed as follows:

1. Create database and table
2. Registration and login function
3. User permission control
4. Permission management page
5. Authentication process

The first step is to create the database and tables. We need to create a database to store user information and permission information. Using MySQL or another database management tool, create a database and name it "user_perm", and then create two tables in the database: "users" and "permissions".

The users table will store users’ basic information, such as username, password, email, etc. It will also contain a field called "role" that identifies the user's role.

The permissions table will store different permission types and their related information. Each permission will be associated with a role. The permissions listed in the table determine the resources a user can access.

The second step is the registration and login functions. We can use PHP to implement user registration and login functions. When a user registers, we verify the information provided by the user and save it to the users table in the database. When a user logs in, we verify their username and password and generate a Session to keep the user logged in throughout the session.

It is worth noting here that for password storage, we should use an encryption algorithm (such as bcrypt) to encrypt the user's password and store it in the database. In this way, even if the database is illegally accessed, the user password will not be leaked.

The third step is user permission control. In the users table, we added a field called "role" that identifies the user's role. We can assign different roles to users, such as "Administrator", "Editor", "General User", etc. Each role will be assigned a set of permissions.

We can use session variables in PHP to store the current user's role information. When a user logs in, we can save their role information in a session variable and use that role to determine whether the user has the right to access a resource.

The fourth step is the rights management page. In order to facilitate the management of permissions, we can create a permission management page. Administrators can use this page to add, modify, or remove permissions. When the administrator makes any changes, we need to update the permissions table in the database, and the next time the user logs in, update their session variables.

The fifth step is the authentication process. When a user attempts to access a protected resource, we need to perform authentication verification. This can be done at the top of each protected page or script. We can check the role of the current user and determine whether access to the resource is allowed based on its role.

For example, if only administrator roles can access a page, we can use the following code for authentication verification:

session_start();
if($_SESSION['role'] != 'admin'){
   // 未授权访问
   echo "Access denied!";
   exit;
}

In this way, when ordinary users try to access the page, they will be It prompts "Access denied!" and access is denied.

To sum up, using PHP and MySQL to implement user permission control can provide flexible and secure access control functions. We can create databases and tables to store user and permission information, implement registration and login functions, and manage user roles and permissions. Through the verification and authentication process, we can ensure that users can only access the resources for which they are authorized.

This practice of user permission control is critical to the security of websites and applications. It not only prevents unauthorized access and potential information leakage, but also helps us implement more fine-grained access control on the system to meet the needs of different users. Therefore, it is very important for PHP developers to learn and master this practical technology.

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