From e4bb12329e8b895bfef4564296624cd47057d2be Mon Sep 17 00:00:00 2001
From: Aidan Woods <aidantwoods@gmail.com>
Date: Tue, 2 May 2017 01:25:33 +0100
Subject: [PATCH] array_keys is probably faster

---
 Parsedown.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Parsedown.php b/Parsedown.php
index 488af4b..d42e4f5 100644
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -1530,9 +1530,9 @@ class Parsedown
                 }
             }
 
-            $onEventAttributes = preg_grep('/^on/i', array_flip($Element['attributes']));
+            $onEventAttributeKeys = preg_grep('/^on/i', array_keys($Element['attributes']));
 
-            foreach ($onEventAttributes as $att)
+            foreach ($onEventAttributeKeys as $att)
             {
                 unset($Element['attributes'][$att]);
             }