1 | <?php |
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2 | /** |
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3 | * @link http://www.yiiframework.com/ |
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4 | * @copyright Copyright (c) 2008 Yii Software LLC |
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5 | * @license http://www.yiiframework.com/license/ |
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6 | */ |
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7 | |||
8 | namespace yii\caching; |
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9 | |||
10 | /** |
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11 | * ExpressionDependency represents a dependency based on the result of a PHP expression. |
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12 | * |
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13 | * ExpressionDependency will use `eval()` to evaluate the PHP expression. |
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14 | * The dependency is reported as unchanged if and only if the result of the expression is |
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15 | * the same as the one evaluated when storing the data to cache. |
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16 | * |
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17 | * A PHP expression can be any PHP code that has a value. To learn more about what an expression is, |
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18 | * please refer to the [php manual](https://secure.php.net/manual/en/language.expressions.php). |
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19 | * |
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20 | * For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview). |
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21 | * |
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22 | * @author Qiang Xue <[email protected]> |
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23 | * @since 2.0 |
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24 | */ |
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25 | class ExpressionDependency extends Dependency |
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26 | { |
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27 | /** |
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28 | * @var string the string representation of a PHP expression whose result is used to determine the dependency. |
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29 | * A PHP expression can be any PHP code that evaluates to a value. To learn more about what an expression is, |
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30 | * please refer to the [php manual](https://secure.php.net/manual/en/language.expressions.php). |
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31 | */ |
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32 | public $expression = 'true'; |
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33 | /** |
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34 | * @var mixed custom parameters associated with this dependency. You may get the value |
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35 | * of this property in [[expression]] using `$this->params`. |
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36 | */ |
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37 | public $params; |
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38 | |||
39 | |||
40 | /** |
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41 | * Generates the data needed to determine if dependency has been changed. |
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42 | * This method returns the result of the PHP expression. |
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43 | * @param CacheInterface $cache the cache component that is currently evaluating this dependency |
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44 | * @return mixed the data needed to determine if dependency has been changed. |
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45 | */ |
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46 | 1 | protected function generateDependencyData($cache) |
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47 | { |
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48 | 1 | return eval("return {$this->expression};"); |
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49 | } |
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50 | } |
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51 |