Merge pull request #2193 from garethellis36/2187-php8.1-deprecation

#2187 Addresses deprecation on PHP 8.1 in ZipArchi

Author: PowerKiKi

src/PhpWord/Shared/ZipArchive.php

@@ -133,6 +133,13 @@ public function open($filename, $flags = null)
 
         if (!$this->usePclzip) {
             $zip = new \ZipArchive();
+
+            // PHP 8.1 compat - passing null as second arg to \ZipArchive::open() is deprecated
+            // passing 0 achieves the same behaviour
+            if ($flags === null) {
+                $flags = 0;
+            }
+
             $result = $zip->open($this->filename, $flags);
 
             // Scrutizer will report the property numFiles does not exist