Merge pull request #2578 from marc1706/ticket/9801

[ticket/9801] Allow display of page outside board directory on viewonline

* marc1706/ticket/9801:
  [ticket/9801] Use empty instead of sizeof
  [ticket/9801] Remove spaces before * in docblock
  [ticket/9801] Add viewonline_helper service to allow proper testing
  [ticket/9801] Allow display of page outside board directory on viewonline

phpBB/phpbb/viewonline_helper.php

@@ -0,0 +1,37 @@
+<?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;
+
+/**
+* Class to handle viewonline related tasks
+*/
+class viewonline_helper
+{
+	/**
+	* Get user page
+	*
+	* @param string $session_page User's session page
+	* @return array Match array filled by preg_match()
+	*/
+	public function get_user_page($session_page)
+	{
+		preg_match('#^([./\\]*+[a-z0-9/_-]+)#i', $session_page, $on_page);
+		if (empty($on_page))
+		{
+			$on_page[1] = '';
+		}
+
+		return $on_page;
+	}
+}