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* @link
* @copyright Copyright (c) 2008 Yii Software LLC
* @license
namespace yii\base;
* StaticInstanceInterface is the interface for providing static instances to classes,
* which can be used to obtain class meta information that can not be expressed in static methods.
* For example: adjustments made by DI or behaviors reveal only at object level, but might be needed
* at class (static) level as well.
* To implement the [[instance()]] method you may use [[StaticInstanceTrait]].
* @author Paul Klimov <>
* @since 2.0.13
* @see StaticInstanceTrait
interface StaticInstanceInterface
* Returns static class instance, which can be used to obtain meta information.
* @param bool $refresh whether to re-create static instance even, if it is already cached.
* @return static class instance.
public static function instance($refresh = false);
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