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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\base;
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use Yii;
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/**
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* StaticInstanceTrait provides methods to satisfy [[StaticInstanceInterface]] interface.
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*
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* @see StaticInstanceInterface
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*
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* @author Paul Klimov <klimov.paul@gmail.com>
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* @since 2.0.13
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*/
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trait StaticInstanceTrait
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{
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/**
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* @var static[] static instances in format: `[className => object]`
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*/
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private static $_instances = [];
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/**
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* Returns static class instance, which can be used to obtain meta information.
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* @param bool $refresh whether to re-create static instance even, if it is already cached.
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* @return static class instance.
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*/
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public static function instance($refresh = false)
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{
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$className = get_called_class();
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if ($refresh || !isset(self::$_instances[$className])) {
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self::$_instances[$className] = Yii::createObject($className);
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}
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return self::$_instances[$className];
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}
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}
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