Function for wordpress to determine whether to show sidebar based on page id

show_sidebar.php

// Need to reset the wordpress query before running
wp_reset_query();
$i = true;
switch($i) {
	case (is_front_page()):
		 $i = false;
	break;
	case (is_page('contact-us')):
		$i = false;
	break;
	default:
		$i = true;
	break;
}

if ($i) include('sidebar.php');

sidebar.php

$side_bar = '';
$i = true;

switch ( $i )
{
	case is_page('page-slug'):
		$side_bar = 'sidebar_name';
		break;
	case is_page('page-slug'):
		$side_bar = 'sidebar_name';
		break;
	case is_page('page-slug'):
		$side_bar = 'sidebar_name';
		break;
	case is_page('page-slug'):
		$side_bar = 'sidebar_name';
		break;
}
// If the sidebar has not been named, use the generic sidebar
if ($side_bar == '')
{
	dynamic_sidebar();
}
// Otherwise use the custom one for the specific page
else
{
	dynamic_sidebar($side_bar);
}