当时这是一个已知的bug

https://core.trac.wordpress.org/ticket/30687

在里面Edit Media, 如果我们查看更新附件上的管理通知，它将使用重定向功能来处理这些通知。所以，基本上我们也可以用重定向函数处理这些错误，然后钩子admin_notices.

下面是我如何处理屏幕错误的方法attachment 编辑媒体。

class my_plugin {

    public function __construct( ) {

        $this->url_pattern = "/^(([\\w]+:)?\\/\\/)?(([\\d\\w]|%[a-fA-f\\d]{2,2})+(:([\\d\\w]|%[a-fA-f\\d]{2,2})+)?@)?" .
"([\\d\\w][-\\d\\w]{0,253}[\\d\\w]\\.)+[\\w]{2,4}(:[\\d]+)?(\\/([-+_~.\\d\\w]|" . 
"%[a-fA-f\\d]{2,2})*)*(\\?(&?([-+_~.\\\\d\\w]|%[a-fA-f\\d]{2,2})=?)*)?(#([-+_~.\\d\\w]" . 
"|%[a-fA-f\\d]{2,2})*)?$/";

        add_filter("attachment_fields_to_edit", array($this, "videourl_image_attachment_fields_to_edit"), 10, 4);
        add_filter("attachment_fields_to_save", array($this, "videourl_image_attachment_fields_to_save"), 20, 2);

        /**
         * Hook admin_notices
         *
         */
        add_action( \'admin_notices\', array( $this, \'admin_notices\' ) );
    }

    /**
     * Fire admin_notices function to show message
     *
     */
    public function admin_notices()
    {
        global $current_screen;

        /**
         * Check current screen
         *
         */
        if ( \'attachment\' == $current_screen->id )
        {
            if ( isset( $_GET[ \'error\' ] ) && 1 == absint( $_GET[ \'error\' ] ) )
            {
                /**
                 * HTML format to show notices
                 *
                 */
                printf ( \'<div id="message" class="%1$s notice is-dismissible"><p>%2$s</p><button type="button" class="notice-dismiss"><span class="screen-reader-text">%3$s.</span></button></div>\',
                    \'error\', //type error or updated
                    __( \'Your Error Messages.\', \'text-domain\' ), //your error text
                    __( \'Dismiss this notice\', \'text-domain\' ) //for close button
                );
            }

            /**
             * Remove query parameter \'message\' and \'error\'
             *
             */
            $_SERVER[\'REQUEST_URI\'] = remove_query_arg( array( \'message\', \'error\' ), $_SERVER[\'REQUEST_URI\'] );
        }
    }

    public function videourl_image_attachment_fields_to_edit($form_fields, $post) {

        $form_fields["videourl"]["label"] = __("Video URL");
        $form_fields["videourl"]["helps"] = "Set a video URL for this image";

        $form_fields["videourl"]["input"] = "text";
        $form_fields["videourl"]["value"] = get_post_meta($post->ID, "_videourl", true);

        return $form_fields;
    }


    public function videourl_image_attachment_fields_to_save( $post, $attachment ) {

        if ( isset( $attachment[\'videourl\'] ) )
        {
            if ( mb_strlen ( trim($attachment[\'videourl\'] ) ) > 0 && preg_match($this->url_pattern, trim($attachment[\'videourl\'] ) ) ) {
                update_post_meta( $post[\'ID\'], \'_videourl\', $attachment[\'videourl\'] );
            } elseif( mb_strlen ( trim($attachment[\'videourl\']) ) == 0 ){
                delete_post_meta( $post[\'ID\'], \'_videourl\' );
            }

            /**
             * Handle error if empty \'videourl\'
             *
             */
            if ( empty( $attachment[\'videourl\'] ) )
            {
                /**
                 * Build error query for redirection
                 *
                 */
                $location = add_query_arg(
                    array(
                        \'error\' => 1
                    ),
                    $post[\'_wp_http_referer\']
                );
                wp_safe_redirect( $location ); // wp-admin/post.php?post={id}&action=edit&error=1
                exit;
            }
        }

        return $post;
    }
}