From d1a9db6257552f4315b27574a1d733f2b4421aa4 Mon Sep 17 00:00:00 2001
From: sakarikl <sakarikl@gmail.com>
Date: Wed, 11 Jan 2023 14:41:45 +0200
Subject: [PATCH] $tok might be false in Tokenizer.php

ctype_alpha(false) triggers warning ctype_alpha(): Argument of type bool will be interpreted as string in the future
---
 src/HTML5/Parser/Tokenizer.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/HTML5/Parser/Tokenizer.php b/src/HTML5/Parser/Tokenizer.php
index 016919a..f436f91 100644
--- a/src/HTML5/Parser/Tokenizer.php
+++ b/src/HTML5/Parser/Tokenizer.php
@@ -131,7 +131,10 @@ protected function consumeData()
 
             $tok = $this->scanner->next();
 
-            if ('!' === $tok) {
+            if (false === $tok) {
+                // end of string
+                $this->parseError('Illegal tag opening');
+            } elseif ('!' === $tok) {
                 $this->markupDeclaration();
             } elseif ('/' === $tok) {
                 $this->endTag();