[ticket/9801] Add viewonline_helper service to allow proper testing

The viewonline_helper service can and will be extended in the future which
will allow us to also test the viewonline page better.

PHPBB3-9801

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, $on_page);
+		if (!sizeof($on_page))
+		{
+			$on_page[1] = '';
+		}
+
+		return $on_page;
+	}
+}