CExpressionDependency

Property Details

expression property

public string $expression;

the PHP expression whose result is used to determine the dependency. The expression can also be a valid serializable PHP callback. It will be passed with a parameter which is the dependency object itself.

The PHP expression will be evaluated using evaluateExpression.

A PHP expression can be any PHP code that has a value. To learn more about what an expression is, please refer to the php manual.

Method Details

__construct() method

public void __construct(string $expression='true')

public function __construct($expression='true')
{
    $this->expression=$expression;
}

Constructor.

generateDependentData() method

protected mixed generateDependentData()

protected function generateDependentData()
{
    return $this->evaluateExpression($this->expression);
}

Generates the data needed to determine if dependency has been changed. This method returns the result of the PHP expression.