Constructive description here

vendor/symfony/http-kernel/Tests/Fixtures/DataCollector/CloneVarDataCollector.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\Fixtures\DataCollector;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\DataCollector;
+
+class CloneVarDataCollector extends DataCollector
+{
+    private $varToClone;
+
+    public function __construct($varToClone)
+    {
+        $this->varToClone = $varToClone;
+    }
+
+    public function collect(Request $request, Response $response, \Exception $exception = null)
+    {
+        $this->data = $this->cloneVar($this->varToClone);
+    }
+
+    public function getData()
+    {
+        return $this->data;
+    }
+
+    public function getName()
+    {
+        return 'clone_var';
+    }
+}