function ConstExprEvaluator::__construct

Create a constant expression evaluator.

The provided fallback evaluator is invoked whenever a subexpression cannot be evaluated. See class doc comment for more information.

Parameters

callable|null $fallbackEvaluator To call if subexpression cannot be evaluated:

File

vendor/nikic/php-parser/lib/PhpParser/ConstExprEvaluator.php, line 41

Class

ConstExprEvaluator: Evaluates constant expressions.

Namespace

Code

public function __construct(?callable $fallbackEvaluator = null) {
    $this->fallbackEvaluator = $fallbackEvaluator ?? function (Expr $expr) {
        throw new ConstExprEvaluationException("Expression of type {$expr->getType()} cannot be evaluated");
    };
}