New in Symfony 6.1: Improved ExpressionLanguage Syntax

The ExpressionLanguage component provides an engine that can compile and evaluate expressions. The main purpose of this component is to use expressions inside configuration for more complex logic. Its other purpose is to use it to build business rule engines. In Symfony 6.1 we're improving the already rich ExpressionLanguage syntax with more features.

New Syntax Options for Numbers

        Contributed by Thomas Calvet
         in #44073.

In order to better align with the expressions supported in modern PHP code, you can now define numbers using the following syntax:

    # you can remove the leading zero of decimal numbers (in previous versions you had to use 0.99)

$expressionLanguage->evaluate('product.price 1_000_000', ['...' => '...']) $expressionLanguage->evaluate('2 3.14159_26535 radius', ['...' => '...'])

New Operators

        Contributed by Fabien Potencier
        and Sofien Naas
         in #45912, #45795.

First, we've added a new ?. operator which is equivalent to the PHP null-safe operator. It prevents errors when trying to access a property or method of an object that is null:

    // this will throw an exception when `fruit` is `null`

$expressionLanguage->evaluate('fruit.color', ['fruit' => '...'])

// this will return null if fruit is null $expressionLanguage->evaluate('fruit?.color', ['fruit' => '...'])

In addition to the null-safe operator, we've added three new operators (contains, starts with and ends with) that allow to create very readable expressions:

    $expressionLanguage->evaluate('coupon.code stars with "XXX"', ['...' => '...'])

$expressionLanguage->evaluate('imported_file.path ends with ".csv"', ['...' => '...']) $expressionLanguage->evaluate('url contains "example.com"', ['...' => '...'])

These operators were already available in Twig templates, making ExpressionLanguage component more in sync with Twig.

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