將一個菜單項添加到網站的首頁

Question

嗨，快樂的程序員。我正在尋找一些我正在使用wordpress作爲CMS的網站的幫助。基本上我試圖在本網站的front page上添加一個名爲'Mood Boards'的菜單項，這樣當用戶將鼠標懸停在'What's Hot'上時，下拉菜單中會包含一個Mood Boards鏈接。由於我使用的是自定義主題，因此很多功能已從wordpress後端中刪除，這意味着我必須破解代碼才能將此項添加到nav。我已經將自定義帖子類型添加到出現在後端菜單中的wordpress中。我的主要問題是我不確定哪個文件直接處理向前端添加菜單項，我相信它是nav-menu.php（參見下文），它使用Walker遍歷樹並添加菜單項。但我不知道這是如何工作，或者即使我在正確的地方尋找！任何幫助將不勝感激，歡呼！

 <?php 
/** 
* Navigation Menu functions 
* 
* @package WordPress 
* @subpackage Nav_Menus 
* @since 3.0.0 
*/ 

/** 
* Returns a navigation menu object. 
* 
* @since 3.0.0 
* 
* @uses get_term 
* @uses get_term_by 
* 
* @param string $menu Menu id, slug or name 
* @return mixed false if $menu param isn't supplied or term does not exist, menu object if successful. 
*/ 
function wp_get_nav_menu_object($menu) { 
    if (! $menu) 
     return false; 

    $menu_obj = get_term($menu, 'nav_menu'); 

    if (! $menu_obj) 
     $menu_obj = get_term_by('slug', $menu, 'nav_menu'); 

    if (! $menu_obj) 
     $menu_obj = get_term_by('name', $menu, 'nav_menu'); 

    if (! $menu_obj) 
     $menu_obj = false; 

    return $menu_obj; 
} 

/** 
* Check if the given ID is a navigation menu. 
* 
* Returns true if it is; false otherwise. 
* 
* @since 3.0.0 
* 
* @param int|string $menu The menu to check (id, slug, or name) 
* @return bool Whether the menu exists. 
*/ 
function is_nav_menu($menu) { 
    if (! $menu) 
     return false; 

    $menu_obj = wp_get_nav_menu_object($menu); 

    if (
     $menu_obj && 
     ! is_wp_error($menu_obj) && 
     ! empty($menu_obj->taxonomy) && 
     'nav_menu' == $menu_obj->taxonomy 
    ) 
     return true; 

    return false; 
} 

/** 
* Register navigation menus for a theme. 
* 
* @since 3.0.0 
* 
* @param array $locations Associative array of menu location identifiers (like a slug) and descriptive text. 
*/ 
function register_nav_menus($locations = array()) { 
    global $_wp_registered_nav_menus; 

    add_theme_support('menus'); 

    $_wp_registered_nav_menus = array_merge((array) $_wp_registered_nav_menus, $locations); 
} 

/** 
* Unregisters a navigation menu for a theme. 
* 
* @param array $location the menu location identifier 
* 
* @return bool True on success, false on failure. 
*/ 
function unregister_nav_menu($location) { 
    global $_wp_registered_nav_menus; 

    if (is_array($_wp_registered_nav_menus) && isset($_wp_registered_nav_menus[$location])) { 
     unset($_wp_registered_nav_menus[$location]); 
     if (empty($_wp_registered_nav_menus)) { 
      _remove_theme_support('menus'); 
     } 
     return true; 
    } 
    return false; 
} 

/** 
* Register a navigation menu for a theme. 
* 
* @since 3.0.0 
* 
* @param string $location Menu location identifier, like a slug. 
* @param string $description Menu location descriptive text. 
*/ 
function register_nav_menu($location, $description) { 
    register_nav_menus(array($location => $description)); 
} 
/** 
* Returns an array of all registered navigation menus in a theme 
* 
* @since 3.0.0 
* @return array 
*/ 
function get_registered_nav_menus() { 
    global $_wp_registered_nav_menus; 
    if (isset($_wp_registered_nav_menus)) 
     return $_wp_registered_nav_menus; 
    return array(); 
} 

/** 
* Returns an array with the registered navigation menu locations and the menu assigned to it 
* 
* @since 3.0.0 
* @return array 
*/ 

function get_nav_menu_locations() { 
    $locations = get_theme_mod('nav_menu_locations'); 
    return (is_array($locations)) ? $locations : array(); 
} 

/** 
* Whether a registered nav menu location has a menu assigned to it. 
* 
* @since 3.0.0 
* @param string $location Menu location identifier. 
* @return bool Whether location has a menu. 
*/ 
function has_nav_menu($location) { 
    $locations = get_nav_menu_locations(); 
    return (! empty($locations[ $location ])); 
} 

/** 
* Determine whether the given ID is a nav menu item. 
* 
* @since 3.0.0 
* 
* @param int $menu_item_id The ID of the potential nav menu item. 
* @return bool Whether the given ID is that of a nav menu item. 
*/ 
function is_nav_menu_item($menu_item_id = 0) { 
    return (! is_wp_error($menu_item_id) && ('nav_menu_item' == get_post_type($menu_item_id))); 
} 

/** 
* Create a Navigation Menu. 
* 
* @since 3.0.0 
* 
* @param string $menu_name Menu Name 
* @return mixed Menu object on success|WP_Error on failure 
*/ 
function wp_create_nav_menu($menu_name) { 
    return wp_update_nav_menu_object(0, array('menu-name' => $menu_name)); 
} 

/** 
* Delete a Navigation Menu. 
* 
* @since 3.0.0 
* 
* @param string $menu name|id|slug 
* @return mixed Menu object on success|WP_Error on failure 
*/ 
function wp_delete_nav_menu($menu) { 
    $menu = wp_get_nav_menu_object($menu); 
    if (! $menu) 
     return false; 

    $menu_objects = get_objects_in_term($menu->term_id, 'nav_menu'); 
    if (! empty($menu_objects)) { 
     foreach ($menu_objects as $item) { 
      wp_delete_post($item); 
     } 
    } 

    $result = wp_delete_term($menu->term_id, 'nav_menu'); 

    // Remove this menu from any locations. 
    $locations = get_nav_menu_locations(); 
    foreach ($locations as $location => $menu_id) { 
     if ($menu_id == $menu->term_id) 
      $locations[ $location ] = 0; 
    } 
    set_theme_mod('nav_menu_locations', $locations); 

    if ($result && !is_wp_error($result)) 

     /** 
     * Fires after a navigation menu has been successfully deleted. 
     * 
     * @since 3.0.0 
     * 
     * @param int $term_id ID of the deleted menu. 
     */ 
     do_action('wp_delete_nav_menu', $menu->term_id); 

    return $result; 
} 

/** 
* Save the properties of a menu or create a new menu with those properties. 
* 
* @since 3.0.0 
* 
* @param int $menu_id The ID of the menu or "0" to create a new menu. 
* @param array $menu_data The array of menu data. 
* @return int|WP_Error object The menu's ID or WP_Error object. 
*/ 
function wp_update_nav_menu_object($menu_id = 0, $menu_data = array()) { 
    $menu_id = (int) $menu_id; 

    $_menu = wp_get_nav_menu_object($menu_id); 

    $args = array(
     'description' => (isset($menu_data['description']) ? $menu_data['description'] : ''), 
     'name'  => (isset($menu_data['menu-name'] ) ? $menu_data['menu-name'] : ''), 
     'parent'  => (isset($menu_data['parent']  ) ? (int) $menu_data['parent'] : 0 ), 
     'slug'  => null, 
    ); 

    // double-check that we're not going to have one menu take the name of another 
    $_possible_existing = get_term_by('name', $menu_data['menu-name'], 'nav_menu'); 
    if (
     $_possible_existing && 
     ! is_wp_error($_possible_existing) && 
     isset($_possible_existing->term_id) && 
     $_possible_existing->term_id != $menu_id 
    ) 
     return new WP_Error('menu_exists', sprintf(__('The menu name <strong>%s</strong> conflicts with another menu name. Please try another.'), esc_html($menu_data['menu-name']))); 

    // menu doesn't already exist, so create a new menu 
    if (! $_menu || is_wp_error($_menu)) { 
     $menu_exists = get_term_by('name', $menu_data['menu-name'], 'nav_menu'); 

     if ($menu_exists) 
      return new WP_Error('menu_exists', sprintf(__('The menu name <strong>%s</strong> conflicts with another menu name. Please try another.'), esc_html($menu_data['menu-name']))); 

     $_menu = wp_insert_term($menu_data['menu-name'], 'nav_menu', $args); 

     if (is_wp_error($_menu)) 
      return $_menu; 

     /** 
     * Fires after a navigation menu is successfully created. 
     * 
     * @since 3.0.0 
     * 
     * @param int $term_id ID of the new menu. 
     * @param array $menu_data An array of menu data. 
     */ 
     do_action('wp_create_nav_menu', $_menu['term_id'], $menu_data); 

     return (int) $_menu['term_id']; 
    } 

    if (! $_menu || ! isset($_menu->term_id)) 
     return 0; 

    $menu_id = (int) $_menu->term_id; 

    $update_response = wp_update_term($menu_id, 'nav_menu', $args); 

    if (is_wp_error($update_response)) 
     return $update_response; 

    /** 
    * Fires after a navigation menu has been successfully updated. 
    * 
    * @since 3.0.0 
    * 
    * @param int $menu_id ID of the updated menu. 
    * @param array $menu_data An array of menu data. 
    */ 
    do_action('wp_update_nav_menu', $menu_id, $menu_data); 
    return $menu_id; 
} 

/** 
* Save the properties of a menu item or create a new one. 
* 
* @since 3.0.0 
* 
* @param int $menu_id The ID of the menu. Required. If "0", makes the menu item a draft orphan. 
* @param int $menu_item_db_id The ID of the menu item. If "0", creates a new menu item. 
* @param array $menu_item_data The menu item's data. 
* @return int|WP_Error The menu item's database ID or WP_Error object on failure. 
*/ 
function wp_update_nav_menu_item($menu_id = 0, $menu_item_db_id = 0, $menu_item_data = array()) { 
    $menu_id = (int) $menu_id; 
    $menu_item_db_id = (int) $menu_item_db_id; 

    // make sure that we don't convert non-nav_menu_item objects into nav_menu_item objects 
    if (! empty($menu_item_db_id) && ! is_nav_menu_item($menu_item_db_id)) 
     return new WP_Error('update_nav_menu_item_failed', __('The given object ID is not that of a menu item.')); 

    $menu = wp_get_nav_menu_object($menu_id); 

    if (! $menu && 0 !== $menu_id) { 
     return new WP_Error('invalid_menu_id', __('Invalid menu ID.')); 
    } 

    if (is_wp_error($menu)) { 
     return $menu; 
    } 

    $defaults = array(
     'menu-item-db-id' => $menu_item_db_id, 
     'menu-item-object-id' => 0, 
     'menu-item-object' => '', 
     'menu-item-parent-id' => 0, 
     'menu-item-position' => 0, 
     'menu-item-type' => 'custom', 
     'menu-item-title' => '', 
     'menu-item-url' => '', 
     'menu-item-description' => '', 
     'menu-item-attr-title' => '', 
     'menu-item-target' => '', 
     'menu-item-classes' => '', 
     'menu-item-xfn' => '', 
     'menu-item-status' => '', 
    ); 

    $args = wp_parse_args($menu_item_data, $defaults); 

    if (0 == $menu_id) { 
     $args['menu-item-position'] = 1; 
    } elseif (0 == (int) $args['menu-item-position']) { 
     $menu_items = 0 == $menu_id ? array() : (array) wp_get_nav_menu_items($menu_id, array('post_status' => 'publish,draft')); 
     $last_item = array_pop($menu_items); 
     $args['menu-item-position'] = ($last_item && isset($last_item->menu_order)) ? 1 + $last_item->menu_order : count($menu_items); 
    } 

    $original_parent = 0 < $menu_item_db_id ? get_post_field('post_parent', $menu_item_db_id) : 0; 

    if ('custom' != $args['menu-item-type']) { 
     /* if non-custom menu item, then: 
      * use original object's URL 
      * blank default title to sync with original object's 
     */ 

     $args['menu-item-url'] = ''; 

     $original_title = ''; 
     if ('taxonomy' == $args['menu-item-type']) { 
      $original_parent = get_term_field('parent', $args['menu-item-object-id'], $args['menu-item-object'], 'raw'); 
      $original_title = get_term_field('name', $args['menu-item-object-id'], $args['menu-item-object'], 'raw'); 
     } elseif ('post_type' == $args['menu-item-type']) { 

      $original_object = get_post($args['menu-item-object-id']); 
      $original_parent = (int) $original_object->post_parent; 
      $original_title = $original_object->post_title; 
     } 

     if ($args['menu-item-title'] == $original_title) 
      $args['menu-item-title'] = ''; 

     // hack to get wp to create a post object when too many properties are empty 
     if ('' == $args['menu-item-title'] && '' == $args['menu-item-description']) 
      $args['menu-item-description'] = ' '; 
    } 

    // Populate the menu item object 
    $post = array(
     'menu_order' => $args['menu-item-position'], 
     'ping_status' => 0, 
     'post_content' => $args['menu-item-description'], 
     'post_excerpt' => $args['menu-item-attr-title'], 
     'post_parent' => $original_parent, 
     'post_title' => $args['menu-item-title'], 
     'post_type' => 'nav_menu_item', 
    ); 

    $update = 0 != $menu_item_db_id; 

    // New menu item. Default is draft status 
    if (! $update) { 
     $post['ID'] = 0; 
     $post['post_status'] = 'publish' == $args['menu-item-status'] ? 'publish' : 'draft'; 
     $menu_item_db_id = wp_insert_post($post); 
     if (! $menu_item_db_id || is_wp_error($menu_item_db_id)) 
      return $menu_item_db_id; 
    } 

    // Associate the menu item with the menu term 
    // Only set the menu term if it isn't set to avoid unnecessary wp_get_object_terms() 
    if ($menu_id && (! $update || ! is_object_in_term($menu_item_db_id, 'nav_menu', (int) $menu->term_id))) { 
     wp_set_object_terms($menu_item_db_id, array($menu->term_id), 'nav_menu'); 
    } 

    if ('custom' == $args['menu-item-type']) { 
     $args['menu-item-object-id'] = $menu_item_db_id; 
     $args['menu-item-object'] = 'custom'; 
    } 

    $menu_item_db_id = (int) $menu_item_db_id; 

    update_post_meta($menu_item_db_id, '_menu_item_type', sanitize_key($args['menu-item-type'])); 
    update_post_meta($menu_item_db_id, '_menu_item_menu_item_parent', strval((int) $args['menu-item-parent-id'])); 
    update_post_meta($menu_item_db_id, '_menu_item_object_id', strval((int) $args['menu-item-object-id'])); 
    update_post_meta($menu_item_db_id, '_menu_item_object', sanitize_key($args['menu-item-object'])); 
    update_post_meta($menu_item_db_id, '_menu_item_target', sanitize_key($args['menu-item-target'])); 

    $args['menu-item-classes'] = array_map('sanitize_html_class', explode(' ', $args['menu-item-classes'])); 
    $args['menu-item-xfn'] = implode(' ', array_map('sanitize_html_class', explode(' ', $args['menu-item-xfn']))); 
    update_post_meta($menu_item_db_id, '_menu_item_classes', $args['menu-item-classes']); 
    update_post_meta($menu_item_db_id, '_menu_item_xfn', $args['menu-item-xfn']); 
    update_post_meta($menu_item_db_id, '_menu_item_url', esc_url_raw($args['menu-item-url'])); 

    if (0 == $menu_id) 
     update_post_meta($menu_item_db_id, '_menu_item_orphaned', (string) time()); 
    elseif (get_post_meta($menu_item_db_id, '_menu_item_orphaned')) 
     delete_post_meta($menu_item_db_id, '_menu_item_orphaned'); 

    // Update existing menu item. Default is publish status 
    if ($update) { 
     $post['ID'] = $menu_item_db_id; 
     $post['post_status'] = 'draft' == $args['menu-item-status'] ? 'draft' : 'publish'; 
     wp_update_post($post); 
    } 

    /** 
    * Fires after a navigation menu item has been updated. 
    * 
    * @since 3.0.0 
    * 
    * @see wp_update_nav_menu_items() 
    * 
    * @param int $menu_id   ID of the updated menu. 
    * @param int $menu_item_db_id ID of the updated menu item. 
    * @param array $args   An array of arguments used to update a menu item. 
    */ 
    do_action('wp_update_nav_menu_item', $menu_id, $menu_item_db_id, $args); 

    return $menu_item_db_id; 
} 

/** 
* Returns all navigation menu objects. 
* 
* @since 3.0.0 
* 
* @param array $args Array of arguments passed on to get_terms(). 
* @return array menu objects 
*/ 
function wp_get_nav_menus($args = array()) { 
    $defaults = array('hide_empty' => false, 'orderby' => 'none'); 
    $args = wp_parse_args($args, $defaults); 

    /** 
    * Filter the navigation menu objects being returned. 
    * 
    * @since 3.0.0 
    * 
    * @see get_terms() 
    * 
    * @param array $menus An array of menu objects. 
    * @param array $args An array of arguments used to retrieve menu objects. 
    */ 
    return apply_filters('wp_get_nav_menus', get_terms('nav_menu', $args), $args); 
} 

/** 
* Sort menu items by the desired key. 
* 
* @since 3.0.0 
* @access private 
* 
* @param object $a The first object to compare 
* @param object $b The second object to compare 
* @return int -1, 0, or 1 if $a is considered to be respectively less than, equal to, or greater than $b. 
*/ 
function _sort_nav_menu_items($a, $b) { 
    global $_menu_item_sort_prop; 

    if (empty($_menu_item_sort_prop)) 
     return 0; 

    if (! isset($a->$_menu_item_sort_prop) || ! isset($b->$_menu_item_sort_prop)) 
     return 0; 

    $_a = (int) $a->$_menu_item_sort_prop; 
    $_b = (int) $b->$_menu_item_sort_prop; 

    if ($a->$_menu_item_sort_prop == $b->$_menu_item_sort_prop) 
     return 0; 
    elseif ($_a == $a->$_menu_item_sort_prop && $_b == $b->$_menu_item_sort_prop) 
     return $_a < $_b ? -1 : 1; 
    else 
     return strcmp($a->$_menu_item_sort_prop, $b->$_menu_item_sort_prop); 
} 

/** 
* Returns if a menu item is valid. Bug #13958 
* 
* @since 3.2.0 
* @access private 
* 
* @param object $menu_item The menu item to check 
* @return bool false if invalid, else true. 
*/ 
function _is_valid_nav_menu_item($item) { 
    if (! empty($item->_invalid)) 
     return false; 

    return true; 
} 

/** 
* Returns all menu items of a navigation menu. 
* 
* @since 3.0.0 
* 
* @param string $menu menu name, id, or slug 
* @param string $args 
* @return mixed $items array of menu items, else false. 
*/ 
function wp_get_nav_menu_items($menu, $args = array()) { 
    $menu = wp_get_nav_menu_object($menu); 

    if (! $menu) 
     return false; 

    static $fetched = array(); 

    $items = get_objects_in_term($menu->term_id, 'nav_menu'); 

    if (empty($items)) 
     return $items; 

    $defaults = array('order' => 'ASC', 'orderby' => 'menu_order', 'post_type' => 'nav_menu_item', 
     'post_status' => 'publish', 'output' => ARRAY_A, 'output_key' => 'menu_order', 'nopaging' => true); 
    $args = wp_parse_args($args, $defaults); 
    if (count($items) > 1) 
     $args['include'] = implode(',', $items); 
    else 
     $args['include'] = $items[0]; 

    $items = get_posts($args); 

    if (is_wp_error($items) || ! is_array($items)) 
     return false; 

    // Get all posts and terms at once to prime the caches 
    if (empty($fetched[$menu->term_id]) || wp_using_ext_object_cache()) { 
     $fetched[$menu->term_id] = true; 
     $posts = array(); 
     $terms = array(); 
     foreach ($items as $item) { 
      $object_id = get_post_meta($item->ID, '_menu_item_object_id', true); 
      $object = get_post_meta($item->ID, '_menu_item_object', true); 
      $type  = get_post_meta($item->ID, '_menu_item_type',  true); 

      if ('post_type' == $type) 
       $posts[$object][] = $object_id; 
      elseif ('taxonomy' == $type) 
       $terms[$object][] = $object_id; 
     } 

     if (! empty($posts)) { 
      foreach (array_keys($posts) as $post_type) { 
       get_posts(array('post__in' => $posts[$post_type], 'post_type' => $post_type, 'nopaging' => true, 'update_post_term_cache' => false)); 
      } 
     } 
     unset($posts); 

     if (! empty($terms)) { 
      foreach (array_keys($terms) as $taxonomy) { 
       get_terms($taxonomy, array('include' => $terms[$taxonomy])); 
      } 
     } 
     unset($terms); 
    } 

    $items = array_map('wp_setup_nav_menu_item', $items); 

    if (! is_admin()) // Remove invalid items only in frontend 
     $items = array_filter($items, '_is_valid_nav_menu_item'); 

    if (ARRAY_A == $args['output']) { 
     $GLOBALS['_menu_item_sort_prop'] = $args['output_key']; 
     usort($items, '_sort_nav_menu_items'); 
     $i = 1; 
     foreach($items as $k => $item) { 
      $items[$k]->$args['output_key'] = $i++; 
     } 
    } 

    /** 
    * Filter the navigation menu items being returned. 
    * 
    * @since 3.0.0 
    * 
    * @param array $items An array of menu item post objects. 
    * @param object $menu The menu object. 
    * @param array $args An array of arguments used to retrieve menu item objects. 
    */ 
    return apply_filters('wp_get_nav_menu_items', $items, $menu, $args); 
} 

/** 
* Decorates a menu item object with the shared navigation menu item properties. 
* 
* Properties: 
* - db_id:   The DB ID of this item as a nav_menu_item object, if it exists (0 if it doesn't exist). 
* - object_id:  The DB ID of the original object this menu item represents, e.g. ID for posts and term_id for categories. 
* - type:  The family of objects originally represented, such as "post_type" or "taxonomy." 
* - object:  The type of object originally represented, such as "category," "post", or "attachment." 
* - type_label: The singular label used to describe this type of menu item. 
* - post_parent: The DB ID of the original object's parent object, if any (0 otherwise). 
* - menu_item_parent: The DB ID of the nav_menu_item that is this item's menu parent, if any. 0 otherwise. 
* - url:  The URL to which this menu item points. 
* - title:  The title of this menu item. 
* - target:  The target attribute of the link element for this menu item. 
* - attr_title: The title attribute of the link element for this menu item. 
* - classes:  The array of class attribute values for the link element of this menu item. 
* - xfn:  The XFN relationship expressed in the link of this menu item. 
* - description: The description of this menu item. 
* 
* @since 3.0.0 
* 
* @param object $menu_item The menu item to modify. 
* @return object $menu_item The menu item with standard menu item properties. 
*/ 
function wp_setup_nav_menu_item($menu_item) { 
    if (isset($menu_item->post_type)) { 
     if ('nav_menu_item' == $menu_item->post_type) { 
      $menu_item->db_id = (int) $menu_item->ID; 
      $menu_item->menu_item_parent = empty($menu_item->menu_item_parent) ? get_post_meta($menu_item->ID, '_menu_item_menu_item_parent', true) : $menu_item->menu_item_parent; 
      $menu_item->object_id = empty($menu_item->object_id) ? get_post_meta($menu_item->ID, '_menu_item_object_id', true) : $menu_item->object_id; 
      $menu_item->object = empty($menu_item->object) ? get_post_meta($menu_item->ID, '_menu_item_object', true) : $menu_item->object; 
      $menu_item->type = empty($menu_item->type) ? get_post_meta($menu_item->ID, '_menu_item_type', true) : $menu_item->type; 

      if ('post_type' == $menu_item->type) { 
       $object = get_post_type_object($menu_item->object); 
       if ($object) { 
        $menu_item->type_label = $object->labels->singular_name; 
       } else { 
        $menu_item->type_label = $menu_item->object; 
        $menu_item->_invalid = true; 
       } 

       $menu_item->url = get_permalink($menu_item->object_id); 

       $original_object = get_post($menu_item->object_id); 
       $original_title = $original_object->post_title; 
       $menu_item->title = '' == $menu_item->post_title ? $original_title : $menu_item->post_title; 

      } elseif ('taxonomy' == $menu_item->type) { 
       $object = get_taxonomy($menu_item->object); 
       if ($object) { 
        $menu_item->type_label = $object->labels->singular_name; 
       } else { 
        $menu_item->type_label = $menu_item->object; 
        $menu_item->_invalid = true; 
       } 

       $term_url = get_term_link((int) $menu_item->object_id, $menu_item->object); 
       $menu_item->url = !is_wp_error($term_url) ? $term_url : ''; 

       $original_title = get_term_field('name', $menu_item->object_id, $menu_item->object, 'raw'); 
       if (is_wp_error($original_title)) 
        $original_title = false; 
       $menu_item->title = '' == $menu_item->post_title ? $original_title : $menu_item->post_title; 

      } else { 
       $menu_item->type_label = __('Custom'); 
       $menu_item->title = $menu_item->post_title; 
       $menu_item->url = empty($menu_item->url) ? get_post_meta($menu_item->ID, '_menu_item_url', true) : $menu_item->url; 
      } 

      $menu_item->target = empty($menu_item->target) ? get_post_meta($menu_item->ID, '_menu_item_target', true) : $menu_item->target; 

      /** 
      * Filter a navigation menu item's title attribute. 
      * 
      * @since 3.0.0 
      * 
      * @param string $item_title The menu item title attribute. 
      */ 
      $menu_item->attr_title = empty($menu_item->attr_title) ? apply_filters('nav_menu_attr_title', $menu_item->post_excerpt) : $menu_item->attr_title; 

      if (empty($menu_item->description)) { 
       /** 
       * Filter a navigation menu item's description. 
       * 
       * @since 3.0.0 
       * 
       * @param string $description The menu item description. 
       */ 
       $menu_item->description = apply_filters('nav_menu_description', wp_trim_words($menu_item->post_content, 200)); 
      } 

      $menu_item->classes = empty($menu_item->classes) ? (array) get_post_meta($menu_item->ID, '_menu_item_classes', true) : $menu_item->classes; 
      $menu_item->xfn = empty($menu_item->xfn) ? get_post_meta($menu_item->ID, '_menu_item_xfn', true) : $menu_item->xfn; 
     } else { 
      $menu_item->db_id = 0; 
      $menu_item->menu_item_parent = 0; 
      $menu_item->object_id = (int) $menu_item->ID; 
      $menu_item->type = 'post_type'; 

      $object = get_post_type_object($menu_item->post_type); 
      $menu_item->object = $object->name; 
      $menu_item->type_label = $object->labels->singular_name; 

      if ('' === $menu_item->post_title) 
       $menu_item->post_title = sprintf(__('#%d (no title)'), $menu_item->ID); 

      $menu_item->title = $menu_item->post_title; 
      $menu_item->url = get_permalink($menu_item->ID); 
      $menu_item->target = ''; 

      /** This filter is documented in wp-includes/nav-menu.php */ 
      $menu_item->attr_title = apply_filters('nav_menu_attr_title', ''); 

      /** This filter is documented in wp-includes/nav-menu.php */ 
      $menu_item->description = apply_filters('nav_menu_description', ''); 
      $menu_item->classes = array(); 
      $menu_item->xfn = ''; 
     } 
    } elseif (isset($menu_item->taxonomy)) { 
     $menu_item->ID = $menu_item->term_id; 
     $menu_item->db_id = 0; 
     $menu_item->menu_item_parent = 0; 
     $menu_item->object_id = (int) $menu_item->term_id; 
     $menu_item->post_parent = (int) $menu_item->parent; 
     $menu_item->type = 'taxonomy'; 

     $object = get_taxonomy($menu_item->taxonomy); 
     $menu_item->object = $object->name; 
     $menu_item->type_label = $object->labels->singular_name; 

     $menu_item->title = $menu_item->name; 
     $menu_item->url = get_term_link($menu_item, $menu_item->taxonomy); 
     $menu_item->target = ''; 
     $menu_item->attr_title = ''; 
     $menu_item->description = get_term_field('description', $menu_item->term_id, $menu_item->taxonomy); 
     $menu_item->classes = array(); 
     $menu_item->xfn = ''; 

    } 

    /** 
    * Filter a navigation menu item object. 
    * 
    * @since 3.0.0 
    * 
    * @param object $menu_item The menu item object. 
    */ 
    return apply_filters('wp_setup_nav_menu_item', $menu_item); 
} 

Answer 1

下面的代碼寫在主題的function.php文件： -

add_filter('wp_nav_menu_items', 'your_custom_menu_item', 10, 2); 

function your_custom_menu_item ($items, $args) { 

    if ($args->theme_location == 'primary') { 

     $items .= '<li>Show whatever</li>'; 

    } 

    return $items; 

}