From d88e167d9cc494a9f5c929f88325a9cbdfbb65d5 Mon Sep 17 00:00:00 2001
From: Asmir Mustafic <goetas@gmail.com>
Date: Fri, 3 Jul 2020 09:27:49 +0200
Subject: mitigate cyclic reference between output rules and the traverser
 objects

---
 src/HTML5.php                        | 5 ++++-
 src/HTML5/Serializer/OutputRules.php | 7 +++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/HTML5.php b/src/HTML5.php
index 94faa1e..c857145 100644
--- a/src/HTML5.php
+++ b/src/HTML5.php
@@ -212,7 +212,10 @@ class HTML5
         $trav = new Traverser($dom, $stream, $rules, $options);
 
         $trav->walk();
-
+        /*
+         * release the traverser to avoid cyclic references and allow PHP to free memory without waiting for gc_collect_cycles
+         */
+        $rules->unsetTraverser();
         if ($close) {
             fclose($stream);
         }
diff --git a/src/HTML5/Serializer/OutputRules.php b/src/HTML5/Serializer/OutputRules.php
index 1c4e892..ec467f2 100644
--- a/src/HTML5/Serializer/OutputRules.php
+++ b/src/HTML5/Serializer/OutputRules.php
@@ -182,6 +182,13 @@ class OutputRules implements RulesInterface
         return $this;
     }
 
+    public function unsetTraverser()
+    {
+        $this->traverser = null;
+
+        return $this;
+    }
+
     public function document($dom)
     {
         $this->doctype();
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