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diff --git a/www/wiki/includes/libs/ReverseArrayIterator.php b/www/wiki/includes/libs/ReverseArrayIterator.php
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+<?php
+/**
+ * Convenience class for iterating over an array in reverse order.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @since 1.27
+ */
+
+/**
+ * Convenience class for iterating over an array in reverse order.
+ *
+ * @since 1.27
+ */
+class ReverseArrayIterator implements Iterator, Countable {
+	/** @var array $array */
+	protected $array;
+
+	/**
+	 * Creates an iterator which will visit the keys in $array in
+	 * reverse order.  If given an object, will visit the properties
+	 * of the object in reverse order.  (Note that the default order
+	 * for PHP arrays and objects is declaration/assignment order.)
+	 *
+	 * @param array|object $array
+	 */
+	public function __construct( $array = [] ) {
+		if ( is_array( $array ) ) {
+			$this->array = $array;
+		} elseif ( is_object( $array ) ) {
+			$this->array = get_object_vars( $array );
+		} else {
+			throw new InvalidArgumentException( __METHOD__ . ' requires an array or object' );
+		}
+
+		$this->rewind();
+	}
+
+	 public function current() {
+		return current( $this->array );
+	 }
+
+	 public function key() {
+		return key( $this->array );
+	 }
+
+	 public function next() {
+		prev( $this->array );
+	 }
+
+	 public function rewind() {
+		end( $this->array );
+	 }
+
+	 public function valid() {
+		return key( $this->array ) !== null;
+	 }
+
+	 public function count() {
+		return count( $this->array );
+	 }
+}