代码不起作用的原因很可能是您之前已经对元数据库进行了排序，并且该顺序已保存到meta-box-order_page 元值。这将覆盖默认设置。

下面是meta-box-order_post 元值：

a:3:{
     s:4:"side";    
         s:61:"submitdiv,formatdiv,categorydiv,tagsdiv-post_tag,postimagediv";
     s:6:"normal";  
         s:96:"revisionsdiv,postexcerpt,trackbacksdiv,postcustom,
               commentstatusdiv,commentsdiv,slugdiv,authordiv";
     s:8:"advanced";
         s:0:"";
}

这里，我刚刚重新格式化了序列化数组，以提高可读性。

粘性元盒：

要将给定元盒移动到顶部位置，对于给定的上下文和post类型，可以使用以下代码段：

/**
 * Set some sticky metaboxes
 */

add_action( \'admin_init\', function()
{
    if( function_exists( \'wpse_sticky_metabox\' ) )
    {
         // Sticky metabox #1:
         wpse_sticky_metabox(
             array(
                 \'cpt\'      => \'page\',
                 \'context\'  => \'normal\',
                 \'metabox\'  => \'postexcerpt\'
             )
         );

         // Sticky metabox #2:
         wpse_sticky_metabox(
             array(
                 \'cpt\'      => \'post\',
                 \'context\'  => \'side\',
                 \'metabox\'  => \'authordiv\' 
             )
         );
    }
});

您可以根据自己的需要进行调整。

有关输入参数的一些信息：

• cpt 是编辑屏幕的自定义贴子类型（即贴子、页面……）
• context 是要使元数据库粘滞的部分。（即正常、侧面、高级、…）
• metabox 是粘滞元框的id（即PostExtract、authordiv、…）

粘性元盒-插件：

以下演示插件支持此功能：

/**
 * Plugin Name: Sticky Meta-Boxes
 * Description: Set a given meta-box to the top, for a given cpt and context.
 * Plugin URI:  http://wordpress.stackexchange.com/a/174980/26350
 * Author:      Birgir Erlendsson (birgire)
 * Version:     0.0.2
 */

function wpse_sticky_metabox( $args = array() )
{
    if( class_exists( \'MetaBoxSticker\' ) )
    {
        $o = new MetaBoxSticker;
        $o->setup( $args )->activate();
    }
}

class MetaBoxSticker
{
    private $args;

    public function setup( $args = array() )
    {
        $default = array(
            \'cpt\'      => \'post\',
            \'context\'  => \'normal\',
            \'metabox\'  => \'postexcerpt\'
        );
        $this->args = wp_parse_args( $args, $default );
        return $this;
    }

    public function activate()
    {
        add_filter(
            sprintf(
                \'get_user_option_meta-box-order_%s\',
                $this->args[\'cpt\']
            ),
            array( $this, \'filter\' ),
            PHP_INT_MAX
        );

        add_action( 
            \'add_meta_boxes\', 
            array( $this, \'relocate\' ), 
            PHP_INT_MAX 
        );
    }

    public function relocate()
    {
        //-----------------------
        // Get the user input:
        //-----------------------
        $_cpt      = sanitize_key( $this->args[\'cpt\']     );
        $_metabox  = sanitize_key( $this->args[\'metabox\'] );
        $_context  = sanitize_key( $this->args[\'context\'] );

        //-----------------------
        // Relocate \'high\' metaboxes to \'default\' in the current context
        //-----------------------                  
        global $wp_meta_boxes;
        if( isset( $wp_meta_boxes[$_cpt][$_context][\'high\'] ) )
        {                                                           
            foreach( $wp_meta_boxes[$_cpt][$_context][\'high\'] as $id => $item )
            {
                if( isset( $item[\'callback\'] ) )
                {
                    remove_meta_box( 
                        $id, 
                        $_cpt, 
                        $_context 
                    );

                    add_meta_box( 
                        $id, 
                        $item[\'title\'], 
                        $item[\'callback\'], 
                        $_cpt, 
                        $_context, 
                        \'default\', 
                        $item[\'args\'] 
                    );
                }
            }
        }
    }

    public function filter( $order )
    {
        //-----------------------
        // Get the user input:
        //-----------------------                               
        $_cpt      = sanitize_key( $this->args[\'cpt\']     );
        $_metabox  = sanitize_key( $this->args[\'metabox\'] );
        $_context  = sanitize_key( $this->args[\'context\'] );

        //-----------------------
        // Handle the case if the current user hasn\'t made any meta-box ordering before:
        //-----------------------
        if( empty( $order ) )
        {
            global $wp_meta_boxes;
            if( ! isset( $wp_meta_boxes[$_cpt][$_context] ) )
               return $order;

            $order = array();
            foreach( $wp_meta_boxes[$_cpt] as $context_key => $context_item )
            {
                $tmp = array();
                foreach( $context_item as $priority_key => $priority_item )
                {
                    foreach( $priority_item as $metabox_key => $metabox_item )
                    {
                        $tmp[] = $metabox_key;
                    }
                }
                $order[$context_key] = join( \',\', $tmp );
            }
        }

        //-----------------------
        // Let\'s make sure the context exists:
        //-----------------------
        if( ! isset( $order[$_context] ) )
            return $order;

        //-----------------------
        // Remove the given meta-box from the whole order array:
        //-----------------------
        foreach( $order as $context_key => $string )
        {
            $tmp = explode( \',\', $string );
            $key = array_search( $_metabox, $tmp );
            if( ! empty( $key ) )
            {
                unset( $tmp[$key] );
                $order[$context_key] = join( \',\', $tmp );
            }
        }

        //-----------------------
        // Make the given meta-box sticky for a given context
        //-----------------------
        $tmp = explode( \',\', $order[$_context] );
        array_unshift( $tmp, $_metabox );
        $order[$_context] = join( \',\', $tmp );

        return $order;
    }

} // end class

这个插件也应该可以工作，即使你以前没有订购过。

它还尊重屏幕选项，即元框是否可见。

我希望你能进一步满足你的需要。