WordPress - Prevent browser from caching authenticated pages

functions.php

function example_update_nocache_headers($headers) {
	$headers['Cache-Control'] = 'no-cache, must-revalidate, max-age=0, no-store';
	$headers['Pragma'] = 'no-cache';
	return $headers;
}

add_filter('nocache_headers','example_update_nocache_headers');