PHPStan fixes

Author: swissspidy

src/Dom/Document/Filter/NormalizeHtmlEntities.php

@@ -92,6 +92,6 @@ protected function hasHtmlEntities($html)
     {
         // TODO: Discuss other popular entities to look for, especially for languages
         // with different punctuation symbols.
-        return preg_match('/,|.|!|?/', $html);
+        return 1 === preg_match('/,|.|!|?/', $html);
     }
 }

src/Optimizer/Transformer/AmpRuntimePreloads.php

@@ -37,7 +37,7 @@ public function transform(Document $document, ErrorCollection $errors)
      * Check whether the AMP runtime script is needed.
      *
      * @param Document $document Document to check in.
-     * @return bool Whether the AMP runtime script is needed.
+     * @return false Whether the AMP runtime script is needed.
      */
     private function isAmpRuntimeScriptNeeded(Document $document)
     {

src/Optimizer/Transformer/ReorderHead.php

@@ -345,7 +345,7 @@ private function containsWord($haystack, $needle)
             return false;
         }
 
-        return preg_match('/(^|\s)' . preg_quote($needle, '/') . '(\s|$)/i', $haystack);
+        return 1 === preg_match('/(^|\s)' . preg_quote($needle, '/') . '(\s|$)/i', $haystack);
     }
 
     /**