What are the best practices for storing user-specific information in a database and retrieving it after login in PHP?

When storing user-specific information in a database, it is best to use a unique identifier such as the user's ID to associate the data with the correct user. After a user logs in, you can retrieve their ID from the session and use it to fetch their information from the database. 

// After user login, store user ID in session
$_SESSION['user_id'] = $user_id;

// Retrieve user-specific information from database after login
$user_id = $_SESSION['user_id'];
$query = "SELECT * FROM users WHERE id = $user_id";
$result = mysqli_query($connection, $query);
$user_data = mysqli_fetch_assoc($result);

// Access user-specific information
echo "Welcome back, " . $user_data['username'];

Keywords

database user-specific information login PHP retrieval

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