PHP 8.2 | Squiz/VariableComment: allow for stand-alone null/true/false types

Since PHP 8.2, stand-alone use of `true`, `false` and `null` is allowed.

However, if these were used as the type for a property, the docblock would not be found.

Fixed now.

Includes unit tests.

Author: jrfnl

src/Standards/Squiz/Sniffs/Commenting/VariableCommentSniff.php

@@ -42,6 +42,9 @@ public function processMemberVar(File $phpcsFile, $stackPtr)
             T_NULLABLE          => T_NULLABLE,
             T_TYPE_UNION        => T_TYPE_UNION,
             T_TYPE_INTERSECTION => T_TYPE_INTERSECTION,
+            T_NULL              => T_NULL,
+            T_TRUE              => T_TRUE,
+            T_FALSE             => T_FALSE,
         ];
 
         for ($commentEnd = ($stackPtr - 1); $commentEnd >= 0; $commentEnd--) {

src/Standards/Squiz/Tests/Commenting/VariableCommentUnitTest.inc

@@ -418,3 +418,21 @@ class IntersectionTypes
      */
     private \Iterator&\Countable $variableName;
 }
+
+class StandaloneNullTrueFalseTypes
+{
+    /**
+     * @var null
+     */
+    public null $variableName = null;
+
+    /**
+     * @var true
+     */
+    protected true $variableName = true;
+
+    /**
+     * @var false
+     */
+    private false $variableName = false;
+}

src/Standards/Squiz/Tests/Commenting/VariableCommentUnitTest.inc.fixed

@@ -418,3 +418,21 @@ class IntersectionTypes
      */
     private \Iterator&\Countable $variableName;
 }
+
+class StandaloneNullTrueFalseTypes
+{
+    /**
+     * @var null
+     */
+    public null $variableName = null;
+
+    /**
+     * @var true
+     */
+    protected true $variableName = true;
+
+    /**
+     * @var false
+     */
+    private false $variableName = false;
+}