Fixed problem with cloning a zip container.

tests/Internal/CustomZip/ZipFileWithBeforeSave.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace PhpZip\Tests\Internal\CustomZip;
+
+use PhpZip\Model\Extra\Fields\NewUnixExtraField;
+use PhpZip\Model\Extra\Fields\NtfsExtraField;
+use PhpZip\ZipFile;
+
+/**
+ * Class ZipFileWithBeforeSave.
+ */
+class ZipFileWithBeforeSave extends ZipFile
+{
+    /**
+     * Event before save or output.
+     */
+    protected function onBeforeSave()
+    {
+        $now = new \DateTimeImmutable();
+        $ntfsTimeExtra = NtfsExtraField::create($now, $now->modify('-1 day'), $now->modify('-10 day'));
+        $unixExtra = new NewUnixExtraField();
+
+        foreach ($this->zipContainer->getEntries() as $entry) {
+            $entry->addExtraField($ntfsTimeExtra);
+            $entry->addExtraField($unixExtra);
+        }
+    }
+}