WordPress 后台用户列表显示用户注册时间

/**
* WordPress 后台用户列表显示注册时间
* https://www.wpdaxue.com/display-user-registerdate.html
*/
class RRHE {
	// Register the column - Registered
	public static function registerdate($columns) {
		$columns['registerdate'] = __('注册时间', 'registerdate');
		return $columns;
	}

	// Display the column content	public static function registerdate_columns( $value, $column_name, $user_id ) {		if ( 'registerdate' != $column_name )			return $value;		$user = get_userdata( $user_id );		$registerdate = get_date_from_gmt($user->user_registered);		return $registerdate;	}
	public static function registerdate_column_sortable($columns) {
		$custom = array(
		  // meta column id => sortby value used in query
			'registerdate'    => 'registered',
			);
		return wp_parse_args($custom, $columns);
	}

	public static function registerdate_column_orderby( $vars ) {
		if ( isset( $vars['orderby'] ) && 'registerdate' == $vars['orderby'] ) {
			$vars = array_merge( $vars, array(
				'meta_key' => 'registerdate',
				'orderby' => 'meta_value'
				) );
		}
		return $vars;
	}

}

// Actions
add_filter( 'manage_users_columns', array('RRHE','registerdate'));
add_action( 'manage_users_custom_column',  array('RRHE','registerdate_columns'), 15, 3);add_filter( 'manage_users_sortable_columns', array('RRHE','registerdate_column_sortable') );
add_filter( 'request', array('RRHE','registerdate_column_orderby') );