Add a list of child pages to the Genesis theme sidebar

sidebar.php

<? php
// Don't include opening php tag

// Add subpages to sidebar
function pb_add_sub_pages_navigation() {

	// Don't do anything if not a page
	if ( ! is_page() ) {
		return;
	}
	
	global $post; // Setup the global variable $post
	
	/*
	 * The title addition is optional. For the theme I was creating we wanted the child page navigation
	 * to have a consistent heading, for example "Paitent Information". Some parent pages had this
	 * Syntax allready and some did not. So we filter the parent page title and add on our addition
	 * if it's not present.
	 */
	
	// Get the parent page title
	$parent_title = get_the_title($post->post_parent);
	$title_addition = __( 'Information', 'daniel-mintie' );
	
	// Search and append parent page title for use in sidebar title
	if ( stripos( $parent_title, 'information' ) !== false ) {
		$parent_title = $parent_title;
	} else {
		$parent_title = $parent_title. ' ' .esc_html($title_addition);
	}
	
	// Make sure we are on a page and that the page is a parent.
	if ( is_page() && $post->post_parent ) {
		$sub_pages = wp_list_pages( 'sort_column=menu_order&title_li=&child_of=' . $post->post_parent . '&echo=0' );
	} else {
		$sub_pages = wp_list_pages( 'sort_column=menu_order&title_li=&child_of=' . $post->ID . '&echo=0' );
	}

	if ( $sub_pages ) {
		// Include subpages view
		include CHILD_DIR . '/inc/views/subpages-menu.php';
	}

}


// Hook our sidebar logic to get_header
add_action( 'get_header', 'pb_swap_primary_sidebar' );
function pb_swap_primary_sidebar() {
	
	// Only want this to run on pages.
	if ( is_page() ) {
		//Remove primary sidebar
		remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
		// Add childpage sidebar
		add_action( 'genesis_sidebar', 'pb_add_sub_pages_navigation' );
	}

}

subpages-menu.php

<div class="subpages-widget-area widget-area">
  <section class="widget subpages">
    <div class="widget-wrap">
      <h3 class="widgettitle widget-title">
        <?php echo $parent_title; ?>
      </h3>
      <ul class="sub-menu">
        <?php echo $sub_pages; ?>
      </ul>
    </div>
  </section>
</div>