我喜欢“tosco”和“sanchothefat answers”这两种答案的想法，但我一直在为这种组合而挣扎，因为empty( $settings[ \'title\' ] 可能确实返回true如果未设置任何标题，小部件本身可能会输出默认标题。然后将此标题包装在before_title 和after_title 标记，然后再次分页符。一些默认小部件就是这样。

更容易坚持标准小部件注册参数；

register_sidebar(array(
    \'id\' => \'sidebar1\',
    \'name\' => __( \'Sidebar 1\', \'bonestheme\' ),
    \'description\' => __( \'The first (primary) sidebar.\', \'bonestheme\' ),
    \'before_widget\' => \'<div class="block">\',
    \'after_widget\' => \'</div>\',
    \'before_title\' => \'<div class="block-title">\',
    \'after_title\' => \'</div>\',
));

http://wordpress.org/support/topic/add-html-wrapper-around-widget-content

function widget_content_wrap($content) {
    $content = \'<div class="block-content">\'.$content.\'</div>\';
    return $content;
}
add_filter(\'widget_text\', \'widget_content_wrap\');

添加第二个div 标题参数：

register_sidebar(array(
        \'name\' => "Sidebar1",
        \'id\' => \'home-sidebar-1\',
        \'before_widget\' => \'<div class="sidebar-box">\',
        \'after_widget\' => \'</div></div>\',
        \'before_title\' => \'<div class="title">\',
        \'after_title\' => \'</div><div class="content">\',
    ));

以下是实现这一目标的方法：

register_sidebar(array(
        \'name\' => "Sidebar1",
        \'id\' => \'home-sidebar-1\',
        \'before_widget\' => \'<div class="sidebar-box"><div class="content">\',
        \'after_widget\' => \'</div></div>\',
        \'before_title\' => \'</div><div class="title">\',
        \'after_title\' => \'</div><div class="content">\',
    ))

<div class="sidebar-box"><div class="content">
{CONTENT}
</div></div>

<div class="sidebar-box"><div class="content">
</div><div class="title">
{TITLE}
<div class="content">
{CONTENT}
</div></div>

.sidebar-box .content:empty {display:none !important;}

在查看了前面的答案后，我想我解决了sanchothefat的答案所确定的问题Cmorales。按如下方式定义小部件：

register_sidebar( array(
    \'name\' => \'Sidebar\',
    \'id\' => \'sidebar\',
    \'before_widget\' => \'<div class="panel panel-default %2$s" id="%1$s">\',
    \'after_widget\' => \'</div>\',
    \'before_title\' => \'\',
    \'after_title\' => \'\'
) );

function widget_title( $title ) {
    if ( $title )
        $title = \'<div class="panel-heading"><h3 class="panel-title">\' . $title . \'</h3></div>\';
    $title .= \'<div class="panel-body">\';
    return $title;
}

function dynamic_sidebar_params( $params ) {
    $params[0][\'after_widget\'] = \'</div>\' . $params[0][\'after_widget\'];
    return $params;
}

我只是稍微修改一下代码，这样就不需要碰register_sidebar. 以常规方式注册侧栏：

register_sidebar(array(
    \'name\' => "Sidebar1",
    \'id\' => \'home-sidebar-1\',
    \'before_widget\' => \'<div class="sidebar-box">\',
    \'after_widget\' => \'</div>\',
    \'before_title\' => \'<div class="title">\',
    \'after_title\' => \'</div>\',
));

/**
 * If no title given then add widget-content wrapper to before_widget
 * If title given then add content wrapper to before_widget
*/
add_filter(\'dynamic_sidebar_params\', \'check_widget_template\');
function check_widget_template($params){
    global $wp_registered_widgets;

    $settings_obj = $wp_registered_widgets[$params[0][\'widget_id\']][\'callback\'][0];
    $the_settings = $settings_obj->get_settings();
    $the_settings = $the_settings[$params[1][\'number\']];

    if (isset($params[0][\'id\']) && $params[0][\'id\'] == \'home-sidebar-1\') {
        if (!isset($the_settings[\'title\']) && empty($the_settings[\'title\'])) {
            $params[0][\'before_widget\'] .= \'<div class="widget-inner">\';
            $params[0][\'after_widget\']  .= \'</div>\';
        } else {
            $params[0][\'after_widget\']  .= \'</div>\';
            $params[0][\'after_title\']   .= \'<div class="widget-inner">\';
        }
    }

    return $params;
}

如评论中所述，一些核心小部件添加了自己的标题，然后用content div包装两次。要删除它们，只需返回一个空字符串即可。唯一的缺点是您必须手动输入所有标题。

function remove_default_widget_title( $title, $instance = [], $id = \'\' ) {
    if ( isset($instance[\'title\']) && trim($instance[\'title\']) == \'\' ) {
        return \'\';
    }
    return $title;
};
add_filter( \'widget_title\', \'remove_default_widget_title\', 10, 3 );