Merge pull request #207 from derrabus/bugfix/php8-null

Fix PHP 8.1 deprecations

1 files changed, 3 insertions, 1 deletions

diff --git a/src/HTML5/Parser/DOMTreeBuilder.php b/src/HTML5/Parser/DOMTreeBuilder.php
index 24bdce8..293d83e 100644
--- a/src/HTML5/Parser/DOMTreeBuilder.php
+++ b/src/HTML5/Parser/DOMTreeBuilder.php
@@ -175,7 +175,7 @@ class DOMTreeBuilder implements EventHandler
             // documents, and attempting to up-convert any older DTDs to HTML5.
             $dt = $impl->createDocumentType('html');
             // $this->doc = \DOMImplementation::createDocument(NULL, 'html', $dt);
-            $this->doc = $impl->createDocument(null, null, $dt);
+            $this->doc = $impl->createDocument(null, '', $dt);
             $this->doc->encoding = !empty($options['encoding']) ? $options['encoding'] : 'UTF-8';
         }
 
@@ -406,6 +406,8 @@ class DOMTreeBuilder implements EventHandler
                 $aName = Elements::normalizeMathMlAttribute($aName);
             }
 
+            $aVal = (string) $aVal;
+
             try {
                 $prefix = ($pos = strpos($aName, ':')) ? substr($aName, 0, $pos) : false;