sidebar-footer.php

<?php
/**
 * The sidebar containing the footer page widget areas.
 *
 * If no active widgets in either sidebar, they will be hidden completely.
 *
 * @package Sela
 */

if ( ! is_active_sidebar( 'sidebar-2' ) && ! is_active_sidebar( 'sidebar-3' ) && ! is_active_sidebar( 'sidebar-4' ) ) {
	return;
}
?>

<div id="tertiary" class="widget-area footer-widget-area" role="complementary">
	<div class="wrap">
		<?php if ( is_active_sidebar( 'sidebar-2' ) ) : ?>
			<div id="widget-area-2" class="widget-area">
				<?php dynamic_sidebar( 'sidebar-2' ); ?>
			</div><!-- #widget-area-2 -->
		<?php endif; ?>

		<?php if ( is_active_sidebar( 'sidebar-3' ) ) : ?>
			<div id="widget-area-3" class="widget-area">
				<?php dynamic_sidebar( 'sidebar-3' ); ?>
			</div><!-- #widget-area-3 -->
		<?php endif; ?>

		<?php if ( is_active_sidebar( 'sidebar-4' ) ) : ?>
			<div id="widget-area-4" class="widget-area">
				<?php dynamic_sidebar( 'sidebar-4' ); ?>
			</div><!-- #widget-area-4 -->
		<?php endif; ?>
	</div><!-- .wrap -->
</div><!-- #tertiary -->