How can PHP be integrated with database configurations to control access to specific website features during maintenance periods?

During maintenance periods, you can integrate PHP with database configurations to control access to specific website features by checking a maintenance flag in the database. If the flag is set to true, restrict access to certain features by redirecting users to a maintenance page. This allows you to easily manage access to website features during maintenance without impacting the overall functionality of the site.

// Check maintenance flag in database
$maintenance = // query to get maintenance flag value from database;

if($maintenance) {
    // Redirect users to maintenance page
    header("Location: maintenance.php");
    exit();
}