Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATE USER statement, and use the PASSWORD() function to encrypt the password. 3. To prevent SQL injection, use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

Do you want to add MySQL users through the PHP web interface? This is a very common requirement, especially when you need to manage database permissions. Here I will explain in detail how to implement this function and share some of the experience and precautions I have accumulated in actual projects.

First, the interaction between PHP and MySQL is done through PHP's MySQLi extension or PDO. I personally prefer to use MySQLi because it provides an object-oriented interface that is more intuitive and manageable. However, PDO also has its advantages, especially in cross-database applications.

Let's start with a simple PHP script to show how to add a MySQL user:

 <?php
$servername = "localhost";
$username = "root";
$password = "your_root_password";
$conn = new mysqli($servername, $username, $password);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$new_username = $_POST[&#39;username&#39;];
$new_password = $_POST[&#39;password&#39;];

$sql = "CREATE USER &#39;$new_username&#39;@&#39;localhost&#39; IDENTIFIED BY &#39;$new_password&#39;";
if ($conn->query($sql) === TRUE) {
    echo "User created successfully";
} else {
    echo "Error creating user: " . $conn->error;
}

$conn->close();
?>

This script shows how to create MySQL users through PHP, but it has a lot to improve. First, we need to consider security issues. It is not safe to directly store the password entered by the user. We should use MySQL's PASSWORD() function to encrypt the password:

 $sql = "CREATE USER '$new_username'@'localhost' IDENTIFIED BY PASSWORD('$new_password')";

In addition, we also need to deal with the security issues of user input and use the mysqli_real_escape_string() function to prevent SQL injection:

 $new_username = mysqli_real_escape_string($conn, $_POST['username']);
$new_password = mysqli_real_escape_string($conn, $_POST['password']);

In actual applications, I found that many developers ignore the management of user permissions. It is not enough to just create a user, we also need to assign appropriate permissions to the user. Here is an example showing how to grant permissions to a specific database to a new user:

 $database = "your_database_name";
$sql = "GRANT SELECT, INSERT, UPDATE, DELETE ON $database.* TO '$new_username'@'localhost'";
if ($conn->query($sql) === TRUE) {
    echo "Permissions granted successfully";
} else {
    echo "Error granting permissions: " . $conn->error;
}

Regarding the advantages and disadvantages of this plan, I have several points to emphasize:

1. Security : Although we used mysqli_real_escape_string() to prevent SQL injection, this is not foolproof. A better approach is to use prepared statements, which can further improve security.

2. Performance : Direct execution of SQL commands may cause performance problems in high concurrency environments. Consider using transactions to batch process user creation and permission assignment operations.

3. User experience : After creating a user, feedback should be provided to the user, such as notifying the user through email that his account has been created, or a success message is displayed on the web page.

4. Error handling : The handling of errors in scripts is relatively simple. In actual applications, there should be more detailed error logs and user-friendly error messages.

In my project experience, I found a common misunderstanding that developers tend to manage users directly in the database and ignore the user management system at the application layer. In fact, the application layer should have an independent user management system that is synchronized with the database user system. This not only improves security, but also better manages user information and permissions.

Finally, I want to share a problem I have encountered: In some cases, the password policy of MySQL users may be different from the password policy of the application layer, which causes the passwords set by the user in the application to fail to pass the verification of MySQL. Therefore, when designing the system, it is necessary to ensure that the password policy of the application layer is consistent with the password policy of the database, or preprocess the password at the application layer to meet the requirements of the database.

I hope these experiences and suggestions can help you become more handy when implementing the addition of features of MySQL users. If you have any questions or need further discussion, please feel free to communicate.

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