[CodingStyle] Handle null item on ManualJsonStringToJsonEncodeArrayRe…

…ctor

rules-tests/CodingStyle/Rector/Assign/ManualJsonStringToJsonEncodeArrayRector/Fixture/null_item.php.inc

@@ -0,0 +1,28 @@
+<?php
+
+namespace Rector\Tests\CodingStyle\Rector\Assign\ManualJsonStringToJsonEncodeArrayRector\Fixture;
+
+final class NullItem
+{
+    public function run()
+    {
+        $json = '{"a":null}';
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\CodingStyle\Rector\Assign\ManualJsonStringToJsonEncodeArrayRector\Fixture;
+
+final class NullItem
+{
+    public function run()
+    {
+        $jsonData = ['a' => null];
+        $json = \Nette\Utils\Json::encode($jsonData);
+    }
+}
+
+?>

src/PhpParser/Node/NodeFactory.php

@@ -575,6 +575,10 @@ public function createClassConstant(string $name, Expr $expr, int $modifier): Cl
     private function createArrayItem($item, string | int | null $key = null): ArrayItem
     {
         $arrayItem = null;
+        if ($item === null) {
+            $item = $this->createNull();
+            $arrayItem = new ArrayItem($item);
+        }
 
         if ($item instanceof Variable
             || $item instanceof MethodCall