From f31e1e8b258eb89ae43a73d0a9bda41e49581edd Mon Sep 17 00:00:00 2001
From: Marina Glancy <marina@moodle.com>
Date: Mon, 14 Nov 2016 15:16:09 +0800
Subject: [PATCH] MDL-56899 filter: suppress dom parsing errors

Domdocument does not know about <video> and <audio> tags, also it's too strict for html style
solution from http://stackoverflow.com/questions/6090667/php-domdocument-errors-warnings-on-html5-tags
---
 lib/weblib.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/weblib.php b/lib/weblib.php
index 75a227c7bf1..97da57a53a3 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -1319,7 +1319,9 @@ function format_text($text, $format = FORMAT_MOODLE, $options = null, $courseidd
 
     if ($options['blanktarget']) {
         $domdoc = new DOMDocument();
+        libxml_use_internal_errors(true);
         $domdoc->loadHTML('<?xml version="1.0" encoding="UTF-8" ?>' . $text);
+        libxml_clear_errors();
         foreach ($domdoc->getElementsByTagName('a') as $link) {
             if ($link->hasAttribute('target') && strpos($link->getAttribute('target'), '_blank') === false) {
                 continue;