如何使用自定义域使用wp_list_ages将顶级父标题替换为图像？

我想整合get_post_meta 进入wp_list_pages 混合，以便只有在帖子的“自定义字段”部分中存在关键字时，才将任何顶级父列表项替换为图像。我不能用特色图片b/c，它已经被用于帖子本身的另一个目的。

这是我在函数中的Walker\\u Page类。php：

/**
 * Extend the default page walker class to append class names for pages that
 * are parents.
 * @uses Walker_Page
 *
 * http://wordpress.stackexchange.com/questions/11821/class-parent-for-wp-list-pages
 *
 */ 
class My_Page_Walker extends Walker_Page
{
    /**
     * Filter in the classes for parents.
     */
     function _filterClass( $class )
     {
         $class[] = \'parent\'; // change this to whatever classe(s) you require
         return $class;
     }

     /**
      * This is effectively a wrapper for the default method, dynamically adding
      * and removing the class filter when the current item has children.
      */
     function start_el( &$output, $page, $depth, $args, $current_page )
     {
         if ( !empty($args[\'has_children\']) )
             add_filter( \'page_css_class\', array( &$this, \'_filterClass\') );

         parent::start_el( $output, $page, $depth, $args, $current_page );

         if ( !empty($args[\'has_children\']) )
             remove_filter( \'page_css_class\', array( &$this, \'_filterClass\') );
     }
 }

因此，我目前正在使用wp_list_pages 要显示自定义帖子类型的帖子，请执行以下操作：

<ul class="items"><?php
$args = array(
    \'walker\'=>new My_Page_Walker,
    \'post_type\' => \'region\',
    \'menu_class\' => \'nav-menus\',
    \'title_li\' => \'\'
);
wp_list_pages($args);
?>
</ul>

它会输出以下代码：

<ul class="items">
     <li class="page_item page-item-123 parent"><a href="/wordpress/region/city/" title="city">City</a>
        <ul class=\'children\'>
           <li class="page_item page-item-124 parent"><a href="/wordpress/region/city/suburb/" title="Suburb">Suburb</a>
              <ul class=\'children\'>
                 <li class="page_item page-item-125"><a href="/wordpress/region/city/suburb/complex/" title="Complex">Complex</a></li>
              </ul>
           </li>
        </ul>
     </li>
 </ul>

我想要以下内容：

<ul class="items">
     <li class="page_item page-item-123 parent"><a href="/wordpress/region/city/" title="city"><img src="city-name.jpg" alt="City" /></a>
        <ul class=\'children\'>
           <li class="page_item page-item-124 parent"><a href="/wordpress/region/city/suburb/" title="Suburb">Suburb</a>
              <ul class=\'children\'>
                 <li class="page_item page-item-125"><a href="/wordpress/region/city/suburb/complex/" title="Complex">Complex</a></li>
              </ul>
           </li>
        </ul>
     </li>
 </ul>

在哪里city-name.jpg 在“自定义字段”部分中定义。它应该只显示具有自定义字段的帖子标题。

这是一个非常复杂的代码量，我不能使用wp_list_pages? 老实说，我在网上找不到答案。

/** * Extend the default page walker class to append class names for pages that * are parents. * @uses Walker_Page * * http://wordpress.stackexchange.com/questions/11821/class-parent-for-wp-list-pages * */ class My_Page_Walker extends Walker_Page { /** * Filter in the classes for parents. */ function _filterClass( $class ) { $class[] = \'parent\'; // change this to whatever classe(s) you require return $class; } /** * This is effectively a wrapper for the default method, dynamically adding * and removing the class filter when the current item has children. */ function start_el( &$output, $page, $depth, $args, $current_page ) { if ( !empty($args[\'has_children\']) ) add_filter( \'page_css_class\', array( &$this, \'_filterClass\') ); if ( $depth ) $indent = str_repeat("\\t", $depth); else $indent = \'\'; extract($args, EXTR_SKIP); $css_class = array(\'page_item\', \'page-item-\'.$page->ID); if ( !empty($current_page) ) { $_current_page = get_page( $current_page ); _get_post_ancestors($_current_page); if ( isset($_current_page->ancestors) && in_array($page->ID, (array) $_current_page->ancestors) ) $css_class[] = \'current_page_ancestor\'; if ( $page->ID == $current_page ) $css_class[] = \'current_page_item\'; elseif ( $_current_page && $page->ID == $_current_page->post_parent ) $css_class[] = \'current_page_parent\'; } elseif ( $page->ID == get_option(\'page_for_posts\') ) { $css_class[] = \'current_page_parent\'; } $css_class = implode(\' \', apply_filters(\'page_css_class\', $css_class, $page)); $output .= $indent . \'<li class="\' . $css_class . \'"><a href="\' . get_permalink($page->ID) . \'">\' . $link_before; $image = get_post_meta($page->ID, \'title_image\', true); if ( isset($image) && !empty($image) ) { $output .= \'<img src="\'. $image .\'" alt="\'. apply_filters( \'the_title\', $page->post_title, $page->ID ) .\'" />\'; } else { $output .= apply_filters( \'the_title\', $page->post_title, $page->ID ); } $output .= $link_after . \'</a>\'; if ( !empty($show_date) ) { if ( \'modified\' == $show_date ) $time = $page->post_modified; else $time = $page->post_date; $output .= " " . mysql2date($date_format, $time); } if ( !empty($args[\'has_children\']) ) remove_filter( \'page_css_class\', array( &$this, \'_filterClass\') ); } }

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