Yii2 Bootstrap 3
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<?php
/**
* ExpressionDependency class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\caching;
/**
* ExpressionDependency represents a dependency based on the result of a PHP expression.
*
* ExpressionDependency performs dependency checking based on the
* result of a PHP {@link expression}.
* The dependency is reported as unchanged if and only if the result is
* the same as the one evaluated when storing the data to cache.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ExpressionDependency extends Dependency
{
/**
* @var string the PHP expression whose result is used to determine the dependency.
* The expression can also be a valid PHP callback,
* including class method name (array(ClassName/Object, MethodName)),
* or anonymous function (PHP 5.3.0+). The function/method will be passed with a
* parameter which is the dependency object itself.
*/
public $expression;
/**
* Constructor.
* @param string $expression the PHP expression whose result is used to determine the dependency.
*/
public function __construct($expression = 'true')
{
$this->expression = $expression;
}
/**
* Generates the data needed to determine if dependency has been changed.
* This method returns the result of the PHP expression.
* @return mixed the data needed to determine if dependency has been changed.
*/
protected function generateDependencyData()
{
return $this->evaluateExpression($this->expression);
}
}