updated core to 1.7.15

system/src/Grav/Framework/Compat/Serializable.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * @package    Grav\Framework\Compat
+ *
+ * @copyright  Copyright (c) 2015 - 2021 Trilby Media, LLC. All rights reserved.
+ * @license    MIT License; see LICENSE file for details.
+ */
+
+namespace Grav\Framework\Compat;
+
+/**
+ * Serializable trait
+ *
+ * Adds backwards compatibility to PHP 7.3 Serializable interface.
+ *
+ * Note: Remember to add: `implements \Serializable` to the classes which use this trait.
+ *
+ * @package Grav\Framework\Traits
+ */
+trait Serializable
+{
+    /**
+     * @return string
+     */
+    final public function serialize(): string
+    {
+        return serialize($this->__serialize());
+    }
+
+    /**
+     * @param string $serialized
+     * @return void
+     */
+    final public function unserialize($serialized): void
+    {
+        $this->__unserialize(unserialize($serialized, ['allowed_classes' => $this->getUnserializeAllowedClasses()]));
+    }
+
+    /**
+     * @return array|bool
+     */
+    protected function getUnserializeAllowedClasses()
+    {
+        return false;
+    }
+}