WordPress 技巧：在下拉菜单中添加日历

add_filter('wp_nav_menu_items','wpjam_add_calendar_2_nav_menu_items', 10, 2);
function wpjam_add_calendar_2_nav_menu_items($items, $args) {
    if( $args->theme_location == 'header-navigation' )
        return $items . '

<li><a href="#">Calendar</a>
<ul class="sub-menu">
<li>' . get_calendar(true,false) . '</li>
</ul>
</li>
';
}

<li><a href="#">Calendar</a>
<ul class="sub-menu">
<li><?php echo get_calendar(true,false);?></li>
</ul>
</li>