sidebar.php

<?php
/**
 * The sidebar containing the main widget area for posts.
 *
 * @package Billie
 */

if ( is_archive() && is_active_sidebar( 'sidebar-4' ) || is_search() && is_active_sidebar( 'sidebar-4' ) ) {
	?>
	<div id="secondary" class="widget-area" role="complementary" aria-label="<?php esc_attr_e( 'Archive sidebar', 'billie' ); ?>">
		<h2 class="screen-reader-text"><?php esc_html_e( 'Sidebar', 'billie' ); ?></h2>
		<?php dynamic_sidebar( 'sidebar-4' ); ?>
	</div><!-- #secondary -->
	<?php
} else {
	if ( ! is_active_sidebar( 'sidebar-1' ) ) {
		return;
	}
	?>
	<div id="secondary" class="widget-area" role="complementary" aria-label="<?php esc_attr_e( 'Post sidebar', 'billie' ); ?>">
		<h2 class="screen-reader-text"><?php esc_html_e( 'Sidebar', 'billie' ); ?></h2>
		<?php dynamic_sidebar( 'sidebar-1' ); ?>
	</div><!-- #secondary -->
	<?php
}