Yii2 framework backup
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<?php
namespace yii\db;
/**
* Interface ExpressionInterface should be used to mark classes, that should be built
* in a special way.
*
* The database abstraction layer of Yii framework supports objects that implement this
* interface and will use [[ExpressionBuilderInterface]] to build them.
*
* The default implementation is a class [[Expression]].
*
* @author Dmytro Naumenko <d.naumenko.a@gmail.com>
* @since 2.0.14
*/
interface ExpressionInterface
{
}