创建了一个侧栏，其中列出了WP的默认页面的子级。然而，有一些断断续续的行为，边栏在一个页面上正确列出了目录，而在另一个页面上却什么也没有列出。

可以看到充分发挥作用的实例here; 在ancestor page here; 以及祖先侧边栏标题出现的位置，但是not the child pages.

因为它在某些页面上工作，但在其他页面上没有，所以我真的不确定到底发生了什么。它们都是相同的模板并调用相同的导航。

我的代码如下：

<?php ( is_page() ) { 
    global $post;
    $ancestors = get_post_ancestors( $post->ID ); // Get the array of ancestors

    //Get the top-level page slug for sidebar/widget content conditionals
        $ancestor_id = ($ancestors) ? $ancestors[count($ancestors)-1]: $post->ID;
        $the_ancestor = get_page( $ancestor_id );
        $ancestor_slug = $the_ancestor->post_name;

     //If there are no ancestors display a menu of children
        if (count($ancestors) == 0 && is_front_page() == false || is_page(\'hammond-society\') ) {
                $page_name = $post->post_title;
                $test_menu = wp_nav_menu( array( 
                    \'theme_location\' => \'main_nav\', 
                    \'menu_class\' => \'nav\',
                    \'container_class\' => \'offset-gutter\',
                    \'items_wrap\' =>  \'<div class="radius-topright" id="sidebar_header"><h5 class="white">Also in <span class="grey bold">\' . $page_name . \'</span></h5></div><ul class="%2$s">%3$s</ul>\',               
                    \'submenu\' => $page_name,
                    \'depth\' => 1,
                    \'echo\' => false
                ));
            if (strpos($test_menu,\'<li id\') !== false) : echo $test_menu; endif;
        }

    //If there are one or more display a menu of siblings
        elseif (count($ancestors) >= 1) {
            $parent_page = get_post($post->post_parent);
            $parent_url = $parent_page->guid;
            $parent_name = $parent_page->post_title;
        ?>

            <div class="offset-gutter radius-topright" id="sidebar_header">
                <h5 class="white">Also in <a href="<?php echo $parent_url;?>" class="grey bold"><?php echo $parent_name ?></a></h5>
            </div>
        <?php
            wp_nav_menu( array( 
                \'theme_location\' => \'main_nav\', 
                \'menu_class\' => \'nav\', 
                \'container_class\' => \'offset-gutter\',
                \'submenu\' => $parent_name,
                \'depth\' => 1                
            ));
        }
    }
?>