[feature/migrations] Migrations now somewhat works

PHPBB3-9737

phpBB/includes/db/migration/exception.php

@@ -0,0 +1,40 @@
+<?php
+/**
+*
+* @package db
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* The migrator is responsible for applying new migrations in the correct order.
+*
+* @package db
+*/
+class phpbb_db_migration_exception extends \Exception
+{
+	protected $parameters;
+
+	public function __construct()
+	{
+		$parameters = func_get_args();
+		$message = array_shift($parameters);
+		parent::__construct($message);
+
+		$this->parameters = $parameters;
+	}
+
+	public function __toString()
+	{
+		return $this->message . ': ' . var_export($this->parameters, true);
+	}
+}