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[ExpressionLanguage] Add enum expression function #17632

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Jan 10, 2023
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[ExpressionLanguage] Add enum expression function #17632

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50 changes: 47 additions & 3 deletions components/expression_language/syntax.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -127,9 +127,16 @@ Working with Functions
----------------------

You can also use registered functions in the expression by using the same
syntax as PHP and JavaScript. The ExpressionLanguage component comes with one
function by default: ``constant()``, which will return the value of the PHP
constant::
syntax as PHP and JavaScript. The ExpressionLanguage component comes with the
following functions by default:

* ``constant()``
* ``enum()``

``constant()`` function
~~~~~~~~~~~~~~~~~~~~~~~

This function will return the value of a PHP constant::

define('DB_USER', 'root');

Expand All @@ -139,6 +146,43 @@ constant::

This will print out ``root``.

This also works with class constants::

namespace App\SomeNamespace;

class Foo
{
public const API_ENDPOINT = '/api';
}

var_dump($expressionLanguage->evaluate(
'constant("App\\\SomeNamespace\\\Foo::API_ENDPOINT")'
));

This will print out ``/api``.

``enum()`` function
~~~~~~~~~~~~~~~~~~~

This function will return the case of an enumeration::

namespace App\SomeNamespace;

enum Foo
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Add a namespace please

{
case Bar;
}

var_dump(App\Enum\Foo::Bar === $expressionLanguage->evaluate(
'enum("App\\\SomeNamespace\\\Foo::Bar")'
));

This will print out ``true``.

.. versionadded:: 6.3

The ``enum()`` function was introduced in Symfony 6.3.

.. tip::

To read how to register your own functions to use in an expression, see
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