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<?php
// Generate correct submenu
function show_subnav() {
	global $post;
	$ancestors = get_post_ancestors($post);
	if( empty($post->post_parent) ) {
		$parent = $post->ID;
	} else {
		$parent = end($ancestors);
	}
	if( isset( $parent ) ):
		foreach( get_pages( array(
			"parent"        => $parent,
		) ) as $page ):
			echo '<li class="page ' . ( $post->ID == $page->ID ? "current-page":"") . '"><a href="' . get_permalink( $page->ID ) . '">' . $page->post_title . '</a>';
			$children = get_pages( array( 'parent' => $page->ID ) );
			if( $children &&  ( $post->ID == $page->ID || in_array( $page->ID, $ancestors ) ) ){
				echo '<ul class="children">';
				foreach( $children as $child ){
					echo '<li class="page sub-page ' . ( $post->ID == $child->ID ? "current-page":"") . '"><a href="' . get_permalink( $child->ID ) . '">' . $child->post_title . '</a>';
					$subchildren= get_pages( array( 'parent' => $child->ID ) );
					if( $subchildren &&  ( $post->ID == $child->ID || in_array( $child->ID, $ancestors ) ) ){
						echo '<ul class="sub-children">';
						foreach( $subchildren as $subchild ){
							echo '<li class="page sub-child ' . ( $post->ID == $subchild->ID ? "current-page":"") . '"><a href="' . get_permalink( $subchild->ID ) . '">' . $subchild->post_title . '</a>';
							$subsubchildren= get_pages( array( 'parent' => $subchild->ID ) );
							if( $subsubchildren &&  ( $post->ID == $subchild->ID || in_array( $subchild->ID, $ancestors ) ) ) {
								echo '<ul class="subsub-children">';
								foreach( $subsubchildren as $subsubchild ) {
									echo '<li class="page subsub-child ' . ( $post->ID == $subsubchild->ID ? "current-page" : "" ) . '"><a href="' . get_permalink( $subsubchild->ID ) . '">' . $subsubchild->post_title . '</a></li>';
								}
								echo '</ul>';
							}
							echo '</li>';
						}
						echo '</ul>';
					}
					echo '</li>';
				}
				echo '</ul>';
			}
			echo '</li>';
		endforeach;
	endif;
}