diff --git a/phpBB/phpbb/tree/nestedset.php b/phpBB/phpbb/tree/nestedset.php
index 13184cf41c..c4ab3b0740 100644
--- a/phpBB/phpbb/tree/nestedset.php
+++ b/phpBB/phpbb/tree/nestedset.php
@@ -663,6 +663,34 @@ abstract class nestedset implements \phpbb\tree\tree_interface
 		return $parents;
 	}
 
+	/**
+	* Get all items from the tree
+	*
+	* Basic data is defined in the $item_basic_data property.
+	*
+	* @param bool		$order_asc		Order the items ascending by their left_id
+	* @return array			Array of items (containing all columns from the item table)
+	*							ID => Item data
+	*/
+	public function get_all_tree_data($order_asc = true)
+	{
+		$rows = array();
+
+		$sql = 'SELECT ' . implode(', ', $this->item_basic_data) . '
+			FROM ' . $this->table_name . ' ' .
+			$this->get_sql_where('WHERE') . '
+			ORDER BY ' . $this->column_left_id . ' ' . ($order_asc ? 'ASC' : 'DESC');
+		$result = $this->db->sql_query($sql);
+
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			$rows[(int) $row[$this->column_item_id]] = $row;
+		}
+		$this->db->sql_freeresult($result);
+
+		return $rows;
+	}
+
 	/**
 	* Remove a subset from the nested set
 	*
diff --git a/tests/tree/nestedset_forum_get_data_test.php b/tests/tree/nestedset_forum_get_data_test.php
index ca1863e55e..a0d0778e82 100644
--- a/tests/tree/nestedset_forum_get_data_test.php
+++ b/tests/tree/nestedset_forum_get_data_test.php
@@ -116,4 +116,20 @@ class phpbb_tests_tree_nestedset_forum_get_data_test extends phpbb_tests_tree_ne
 		$forum_data['forum_parents'] = $forum_parents;
 		$this->assertEquals($expected, array_keys($this->set->get_path_basic_data($forum_data)));
 	}
+
+	public function get_all_tree_data_data()
+	{
+		return array(
+			array(true, array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)),
+			array(false, array(11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)),
+		);
+	}
+
+	/**
+	* @dataProvider get_all_tree_data_data
+	*/
+	public function test_get_all_tree_data($order_asc, $expected)
+	{
+		$this->assertEquals($expected, array_keys($this->set->get_all_tree_data($order_asc)));
+	}
 }