fix PHP 8.0 compatibility

Author: liborm85

src/PhpWord/Shared/XMLReader.php

@@ -72,10 +72,14 @@ public function getDomFromZip($zipFile, $xmlFile)
      */
     public function getDomFromString($content)
     {
-        $originalLibXMLEntityValue = libxml_disable_entity_loader(true);
+        if (\PHP_VERSION_ID < 80000) {
+            $originalLibXMLEntityValue = libxml_disable_entity_loader(true);
+        }
         $this->dom = new \DOMDocument();
         $this->dom->loadXML($content);
-        libxml_disable_entity_loader($originalLibXMLEntityValue);
+        if (\PHP_VERSION_ID < 80000) {
+            libxml_disable_entity_loader($originalLibXMLEntityValue);
+        }
 
         return $this->dom;
     }

tests/PhpWord/Shared/XMLWriterTest.php

@@ -66,7 +66,6 @@ public function testWriteAttributeShouldWriteFloatValueLocaleIndependent()
 
         setlocale(LC_NUMERIC, 'de_DE.UTF-8', 'de');
 
-        $this->assertSame('1,2', (string)$value);
         $this->assertSame('<element name="1.2"/>' . chr(10), $xmlWriter->getData());
 
         setlocale(LC_NUMERIC, $currentLocale);