[ticket/13126] Move migrator_output_handler to an interface

PHPBB3-13126

phpBB/phpbb/db/migrator_output_handler_interface.php

@@ -0,0 +1,31 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db;
+
+interface migrator_output_handler_interface
+{
+	const VERBOSITY_QUIET        = 0;
+	const VERBOSITY_NORMAL       = 1;
+	const VERBOSITY_VERBOSE      = 2;
+	const VERBOSITY_VERY_VERBOSE = 3;
+	const VERBOSITY_DEBUG        = 4;
+
+	/**
+	 * Write output using the configured closure.
+	 *
+	 * @param string|array $message The message to write or an array containing the language key and all of its parameters.
+	 * @param int $verbosity The verbosity of the message.
+	 */
+	public function write($message, $verbosity);
+}