[DeadCode] Skip shifted variable

rules/dead-code/src/Rector/FunctionLike/RemoveDuplicatedIfReturnRector.php

@@ -121,8 +121,10 @@ PHP
         foreach ((array) $functionLike->getStmts() as $stmt) {
             if (! $this->ifManipulator->isIfWithOnlyReturn($stmt)) {
                 // variable modification
-                $modifiedVariableNames += $this->modifiedVariableNamesCollector->collectModifiedVariableNames($stmt);
-
+                $modifiedVariableNames = array_merge(
+                    $modifiedVariableNames,
+                    $this->modifiedVariableNamesCollector->collectModifiedVariableNames($stmt)
+                );
                 continue;
             }
 

rules/dead-code/tests/Rector/FunctionLike/RemoveDuplicatedIfReturnRector/Fixture/skip_array_shifted_value.php.inc

@@ -0,0 +1,23 @@
+<?php
+
+namespace Rector\DeadCode\Tests\Rector\FunctionLike\RemoveDuplicatedIfReturnRector\Fixture;
+
+class SkipArrayShiftedValue
+{
+    public function output(array $rows): void
+    {
+        if (empty($rows)) {
+            return;
+        }
+
+        $widths = [];
+
+        if (mt_rand(0, 100)) {
+            array_shift($rows);
+        }
+
+        if (empty($rows)) {
+            return;
+        }
+    }
+}