Doctrine\MongoDB\Aggregation\Stage\Operator::let PHP Method

Binds variables for use in the specified expression, and returns the result of the expression.

See also: http://docs.mongodb.org/manual/reference/operator/aggregation/let/

See also: Expr::let

public let ( mixed \| Expr $vars, mixed \| Expr $in )
$vars	mixed \| Doctrine\MongoDB\Aggregation\Expr	Assignment block for the variables accessible in the in expression. To assign a variable, specify a string for the variable name and assign a valid expression for the value.
$in	mixed \| Doctrine\MongoDB\Aggregation\Expr	The expression to evaluate.

    public function let($vars, $in)
    {
        $this->expr->let($vars, $in);
        return $this;
    }

Operator