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cms-core/Documentation/Changelog/13.3/Deprecation-104789-FluidVariablesTrueFalseNull.rst

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.. include:: /Includes.rst.txt
.. _deprecation-104789-1725196704:
========================================================
Deprecation: #104789 - Fluid variables true, false, null
========================================================
See :issue:`104789`
Description
===========
Fluid standalone will add proper language syntax for booleans and `null`
with Fluid v4, which will be used in TYPO3 v13. Thus, user-defined variables
named `true`, `false` and `null` are no longer allowed.
Impact
======
Assigning variables with name `true`, `false` or `null` will throw
an exception in Fluid v4. In preparation of this change, Fluid v2.15 logs a
deprecation level error message if any of these variable names are used.
Affected installations
======================
Instances with Fluid templates using `true`, `false` or `null` as user-defined variable names.
This should rarely happen, as it would involve using :php:`$view->assign('true', $someVar)`.
Migration
=========
Template code using these variables should be adjusted to use different variable names.
In Fluid v4, the variables will contain their matching PHP counterparts.
.. index:: Fluid, NotScanned, ext:fluid