What are the best practices for handling maintenance mode in PHP applications to ensure minimal disruption to users and maximum security?

When a PHP application is in maintenance mode, it is important to ensure minimal disruption to users and maximum security. One best practice is to create a maintenance mode page that informs users of the temporary downtime and prevents unauthorized access to the application. This can be achieved by checking a maintenance mode flag in the application configuration and redirecting users to the maintenance page if the flag is set. 

// Check if maintenance mode is enabled
if ($maintenance_mode) {
    header('HTTP/1.1 503 Service Unavailable');
    header('Status: 503 Service Unavailable');
    include('maintenance_page.php');
    exit;
}

Keywords

maintenance mode PHP applications disruption security best practices

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