TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:09 +02:00
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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