菜单：

• wp_nav_menu()
• register_nav_menu()codex - Widgetizing Themes

  面包屑：看这个pastebin

这并不能回答你所有的问题，但当我学习这些小部件时，我很难找到一个好的、可靠的样本来学习。这是我用来参考的一个enigma 可以这么说；）

//CONSTRUCT Class
class my_custom_widget extends WP_Widget {
function my_custom_widget() {
    $widget_ops = array(\'classname\' => \'text_plus_widget\', \'description\' => \'Title Bar, Text Area, and Link URL\' );
    //WIDGET Name
    $this->WP_Widget(\'hs_text_plus\', \'Text Plus Widget\', $widget_ops);
}
//WIDGET Args
function widget($args, $instance) {
    extract($args, EXTR_SKIP);
    echo $before_widget;
    //WIDGET Database Checks
    $title = empty($instance[\'title\']) ? \' \' : apply_filters(\'widget_hs_text_plus_title\', $instance[\'title\']);
    $text_area = empty($instance[\'text_area\']) ? \' \' : apply_filters(\'widget_hs_text_plus_text_area\', $instance[\'text_area\']);
    $link_url = empty($instance[\'link_url\']) ? \' \' : apply_filters(\'widget_hs_text_plus_link_url\', $instance[\'link_url\']);

    ?>
    <li>
        <?php if ( !empty( $title ) && (strlen($title) > 1 )) { echo $before_title . $title . $after_title; }; ?>
        <?php if ( !empty( $text_area ) && (strlen($text_area) > 1 )) { echo \'<p>\' . $text_area . \'</p>\'; }; ?>
        <?php if ( !empty( $link_url ) && (strlen($link_url) > 1 )) { echo \'<a href="\' . $link_url . \'">Click Here to Learn More</a>\'; }; ?>
        <div class="clr" style="display: block; height: 20px;"></div>
    </li>
    <?php
    echo $after_widget;
}
//WIDGET Save
function update($new_instance, $old_instance) {
    $instance = $old_instance;
    $instance[\'title\'] = strip_tags($new_instance[\'title\']);
    $instance[\'text_area\'] = strip_tags($new_instance[\'text_area\']);
    $instance[\'link_url\'] = strip_tags($new_instance[\'link_url\']);
    return $instance;
}
//WIDGET Admin Form
function form($instance) {
    //set your params, $instance and then any additional variables needed below
    $instance = wp_parse_args( (array) $instance, array( \'title\' => \'\', \'text_area\' => \'\', \'link_url\' => \'\' ) );
    $title = strip_tags($instance[\'title\']);
    $text_area = strip_tags($instance[\'text_area\']);
    $link_url = strip_tags($instance[\'link_url\']);
?>
        <p><label for="<?php echo $this->get_field_id(\'title\'); ?>">Widget Title: <input class="widefat" id="<?php echo $this->get_field_id(\'title\'); ?>" name="<?php echo $this->get_field_name(\'title\'); ?>" type="text" value="<?php echo esc_attr__($title); ?>" /></label></p>
        <p><label for="<?php echo $this->get_field_id(\'text_area\'); ?>">Widget Text: <textarea class="widefat" id="<?php echo $this->get_field_id(\'text_area\'); ?>" name="<?php echo $this->get_field_name(\'text_area\'); ?>" ><?php echo esc_attr__($text_area); ?></textarea></label></p>
        <p><label for="<?php echo $this->get_field_id(\'link_url\'); ?>">Link URL: <input class="widefat" id="<?php echo $this->get_field_id(\'link_url\'); ?>" name="<?php echo $this->get_field_name(\'link_url\'); ?>" type="text" value="<?php echo esc_attr__($link_url); ?>" /></label></p>
<?php
    }
}

 //CREATE Widget
 add_action( \'widgets_init\', create_function(\'\', \'return register_widget("my_custom_widget");\') );