.. _php-useenumcaseinconstantexpression:

.. _use-enum-case-in-constant-expression:

Use Enum Case In Constant Expression
++++++++++++++++++++++++++++++++++++

  Enum cases are constants, and may be used in constant definitions, as value. This is valid both with the case itself, or with their value, for the backed enum version.

.. code-block:: php
   
   <?php
   
   enum A {
   	case A;
   }
   
   enum B : string {
   	case B = 'b';
   }
   
   class C {
   	const C1 = A::A;
   	const C2 = B::B->value;
   }
   ?>

Specs
_____

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| Short name   | Php/UseEnumCaseInConstantExpression                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| Rulesets     | :ref:`All <ruleset-All>`, :ref:`Appinfo <ruleset-Appinfo>`, :ref:`Changed Behavior <ruleset-Changed-Behavior>`, :ref:`CompatibilityPHP53 <ruleset-CompatibilityPHP53>`, :ref:`CompatibilityPHP54 <ruleset-CompatibilityPHP54>`, :ref:`CompatibilityPHP55 <ruleset-CompatibilityPHP55>`, :ref:`CompatibilityPHP56 <ruleset-CompatibilityPHP56>`, :ref:`CompatibilityPHP70 <ruleset-CompatibilityPHP70>`, :ref:`CompatibilityPHP71 <ruleset-CompatibilityPHP71>`, :ref:`CompatibilityPHP72 <ruleset-CompatibilityPHP72>`, :ref:`CompatibilityPHP73 <ruleset-CompatibilityPHP73>`, :ref:`CompatibilityPHP74 <ruleset-CompatibilityPHP74>`, :ref:`CompatibilityPHP80 <ruleset-CompatibilityPHP80>`, :ref:`CompatibilityPHP81 <ruleset-CompatibilityPHP81>` |
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| Exakat since | 2.5.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| PHP Version  | With PHP 8.2 and more recent                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| Severity     | Minor                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| Time To Fix  | Quick (30 mins)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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| Precision    | Medium                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| Available in | `Entreprise Edition <https://www.exakat.io/entreprise-edition>`_, `Exakat Cloud <https://www.exakat.io/exakat-cloud/>`_                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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