让多用户作者的WordPress多媒体库只显示自己上传的文件

/**
 * WordPress 多用媒体库只显示用户自己上传的文件
 */
//在文章编辑页面的[添加媒体]只显示用户自己上传的文件
function my_upload_media( $wp_query_obj ) {
	global $current_user, $pagenow;
	if( !is_a( $current_user, 'WP_User') )
		return;
	if( 'admin-ajax.php' != $pagenow || $_REQUEST['action'] != 'query-attachments' )
		return;
	if( !current_user_can( 'manage_options' ) && !current_user_can('manage_media_library') )
		$wp_query_obj->set('author', $current_user->ID );
	return;
}
add_action('pre_get_posts','my_upload_media');

//在[媒体库]只显示用户上传的文件
function my_media_library( $wp_query ) {
    if ( strpos( $_SERVER[ 'REQUEST_URI' ], '/wp-admin/upload.php' ) !== false ) {
        if ( !current_user_can( 'manage_options' ) && !current_user_can( 'manage_media_library' ) ) {
            global $current_user;
            $wp_query->set( 'author', $current_user->id );
        }
    }
}
add_filter('parse_query', 'my_media_library' );