A WordPress post list with ad

post-list-with-ad.php

<?php
/**
 * Displays a list of posts with an ad
 *
 * @package Pointhacks
 */

$post_list_title       = get_query_var( 'post-list-title', 'Post list' );
$post_list_klass       = get_query_var( 'post-list-klass', 'post-list--default' );
$post_list_posts       = get_query_var( 'post-list-posts', null );
$post_list_post_format = get_query_var( 'post-list-post-format', '' );
$post_list_ad          = get_query_var( 'post-list-ad', null );

if ( empty( $post_list_posts ) ) {
	return;
}

?>

<section class="post-list <?php echo esc_attr( $post_list_klass ); ?>">
	<h3 class="post-list-title">
		<span class="text"><?php echo esc_attr( $post_list_title ); ?></span>
	</h3>
	<div class="post-list-items">
		<?php
			foreach ( $post_list_posts as $index => $post ) {
				if ( ! empty( $post_list_ad ) ) {
					if ( $index === $post_list_ad['insert_at'] ) {
						echo $post_list_ad['content'];
					}
				}
				get_template_part( 'template-parts/post/post', $post_list_post_format );
			}
		?>
	</div>
</section>