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<?php
/**
* @link https://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license https://www.yiiframework.com/license/
*/
namespace yii\base;
use Yii;
/**
* StaticInstanceTrait provides methods to satisfy [[StaticInstanceInterface]] interface.
*
* @see StaticInstanceInterface
*
* @author Paul Klimov <klimov.paul@gmail.com>
* @since 2.0.13
*/
trait StaticInstanceTrait
{
/**
* @var static[] static instances in format: `[className => object]`
*/
private static $_instances = [];
/**
* 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)
{
$className = get_called_class();
if ($refresh || !isset(self::$_instances[$className])) {
self::$_instances[$className] = Yii::createObject($className);
}
return self::$_instances[$className];
}
}