sidebar inter posts

/* WIDGET AREAS aka SIDEBARS INBETWEEN POSTS IN LOOP OF INDEX PAGE */

add_action( 'after_setup_theme', 'twentyfifteen_child_setup' );

function twentyfifteen_child_setup() {
add_action( 'widgets_init', 'twentyfifteen_child_widgets_init' );
add_filter( 'body_class', 'twentyfifteen_child_body_class' );
add_action( 'the_post', 'twentyfifteen_child_inter_posts_sidebars' );
}

//register sidebar for inbetween posts

function twentyfifteen_child_widgets_init() {

	register_sidebar( array(
		'name' => __( 'First Inter-Posts Widget Area ', 'twentyfifteen' ),
		'id' => 'inter-posts-1',
		'description'   => __( 'Add widgets here to appear between post 1 and 2 in your index page.', 'twentyfifteen' ),
		'before_widget' => '<aside id="%1$s" class="widget inter-post-widget %2$s">',
		'after_widget'  => '</aside>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );

}

//body class correction

function twentyfifteen_child_body_class( $classes ) {

	if ( is_active_sidebar( 'inter-posts-1' ) ) {
      if( is_home() ) $classes[] = 'widgets-between-posts';
    }
	return $classes;
}

//widget output between posts in index page

function twentyfifteen_child_inter_posts_sidebars() {
	global $wp_query;
	if( is_home() && $wp_query->current_post == 1 ) {
		dynamic_sidebar( 'inter-posts-1' );
	}

}