[CodeQuality] Skip ArrayDimFetch with BitwiseXor on CombinedAssignRector (#7590)

Author: samsonasik

rules-tests/CodeQuality/Rector/Assign/CombinedAssignRector/Fixture/skip_xor_array_dim_fetch.php.inc

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\CodeQuality\Rector\Assign\CombinedAssignRector\Fixture;
+
+class skipXorArrayDimFetch
+{
+    public function run()
+    {
+        $string = 'Hello world';
+        $string[5] = $string[5] ^ '\x06';
+        echo $string, "\n";
+    }
+}
+
+?>

rules/CodeQuality/Rector/Assign/CombinedAssignRector.php

@@ -5,8 +5,10 @@
 namespace Rector\CodeQuality\Rector\Assign;
 
 use PhpParser\Node;
+use PhpParser\Node\Expr\ArrayDimFetch;
 use PhpParser\Node\Expr\Assign;
 use PhpParser\Node\Expr\BinaryOp;
+use PhpParser\Node\Expr\BinaryOp\BitwiseXor;
 use Rector\PhpParser\Node\AssignAndBinaryMap;
 use Rector\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
@@ -54,6 +56,12 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
+        if ($binaryNode->left instanceof ArrayDimFetch &&
+            $node->expr instanceof BitwiseXor
+        ) {
+            return null;
+        }
+
         $assignClass = $this->assignAndBinaryMap->getAlternative($binaryNode);
         if ($assignClass === null) {
             return null;