WP_MS_Themes_List_Table::_order_callback( array $theme_a, array $theme_b )

	public function _order_callback( $theme_a, $theme_b ) {
		global $orderby, $order;

		$a = $theme_a[ $orderby ];
		$b = $theme_b[ $orderby ];

		if ( $a == $b )
			return 0;

		if ( 'DESC' === $order )
			return ( $a < $b ) ? 1 : -1;
		else
			return ( $a < $b ) ? -1 : 1;
	}