First full implementation of new storage routine.

app/Support/NullArrayObject.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ * NullArrayObject.php
+ * Copyright (c) 2019 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Support;
+
+
+use ArrayObject;
+
+class NullArrayObject extends ArrayObject
+{
+    public $default = null;
+
+    /**
+     * NullArrayObject constructor.
+     *
+     * @param array $array
+     * @param null  $default
+     */
+    public function __construct(array $array, $default = null)
+    {
+        parent::__construct($array);
+        $this->default = $default;
+    }
+
+    /**
+     * @param mixed $key
+     *
+     * @return mixed|null
+     */
+    public function offsetGet($key)
+    {
+        if ($this->offsetExists($key)) {
+            return parent::offsetGet($key);
+        }
+
+        return null;
+    }
+}