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[ExpressionLanguage] Add flags support in parse() and lint() #19529

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Feb 7, 2024
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[ExpressionLanguage] Add flags support in parse() and lint() #19529

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24 changes: 24 additions & 0 deletions components/expression_language.rst
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Expand Up @@ -112,6 +112,30 @@ other hand, returns a boolean indicating if the expression is valid or not::

var_dump($expressionLanguage->lint('1 + 2')); // displays true

The call to these methods can be configured through flags. The available flags
are available in the :class:`Symfony\\Component\\ExpressionLanguage\\Parser` class
and are the following:

* ``IGNORE_UNKNOWN_VARIABLES``: don't throw an exception if a variable is not
defined in the expression;
* ``IGNORE_UNKNOWN_FUNCTIONS``: don't throw an exception if a function is not
defined in the expression.

This is how you can use these flags::

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\ExpressionLanguage\Parser;

$expressionLanguage = new ExpressionLanguage();

// this return true because the unknown variables and functions are ignored
var_dump($expressionLanguage->lint('unknown_var + unknown_function()', Parser::IGNORE_UNKNOWN_VARIABLES | Parser::IGNORE_UNKNOWN_FUNCTIONS));

.. versionadded:: 7.1

The support for flags in the ``parse()`` and ``lint()`` methods
was introduced in Symfony 7.1.

Passing in Variables
--------------------

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