How can PHP developers implement user authentication and authorization in their scripts effectively?

To implement user authentication and authorization in PHP scripts effectively, developers can use sessions to store user login information and roles. They can also use database queries to validate user credentials and check permissions before allowing access to certain parts of the application. 

// Start the session
session_start();

// Check if the user is logged in
if(!isset($_SESSION['user_id'])) {
    // Redirect to login page
    header("Location: login.php");
    exit();
}

// Check if the user has the necessary role
if($_SESSION['role'] != 'admin') {
    // Redirect to unauthorized page
    header("Location: unauthorized.php");
    exit();
}

Keywords

PHP user authentication user authorization script implementation security measures

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