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function obtain_users_online_string($online_users, $forum_id = 0)
{
	global $config, $db, $user, $auth;

	$user_online_link = $online_userlist = $user_online_avatar = '';

	if (sizeof($online_users['online_users']))
	{
		$sql = 'SELECT username, username_clean, user_id, user_type, user_allow_viewonline, user_colour, user_avatar, user_avatar_type, user_avatar_width, user_avatar_height 
				FROM ' . USERS_TABLE . '
				WHERE ' . $db->sql_in_set('user_id', $online_users['online_users']) . '
				ORDER BY username_clean ASC';
		$result = $db->sql_query($sql);
				$max_avatar_online_users = $avatar_width_online_users = $avatar_height_online_users	= '';
		while ($row = $db->sql_fetchrow($result))
		{
			// User is logged in and therefore not a guest
			if ($row['user_id'] != ANONYMOUS)
			{
				$max_avatar_online_users = 40; // here you can change the max-width you would like to have the avatars displayed, change to 0 to use default 
				
				if ( !empty($row['user_avatar']) )
				{
					if ( $max_avatar_online_users )
					{	
						if ( $row['user_avatar_width'] >= $row['user_avatar_height'] )
						{
							$avatar_width_online_users = ( $row['user_avatar_width'] > $max_avatar_online_users ) ? $max_avatar_online_users : $row['user_avatar_width'] ;
							$avatar_height_online_users = ( $avatar_width_online_users == $max_avatar_online_users ) ? round($max_avatar_online_users / $row['user_avatar_width'] * $row['user_avatar_height']) : $row['user_avatar_height'] ;
						}
						else 
						{
							$avatar_height_online_users = ( $row['user_avatar_height'] > $max_avatar_online_users ) ? $max_avatar_online_users : $row['user_avatar_height'] ;
							$avatar_width_online_users = ( $avatar_height_online_users == $max_avatar_online_users ) ? round($max_avatar_online_users / $row['user_avatar_height'] * $row['user_avatar_width']) : $row['user_avatar_width'] ;
						}
					}
					else
					{
						$avatar_height_online_users 	= $row['user_avatar_height'];
						$avatar_width_online_users 	= $row['user_avatar_width'];
					}
				}

				if (isset($online_users['hidden_users'][$row['user_id']]))
				{
//					$row['username'] = '<em>' . $row['username'] . '</em>';
					$row['username'] = $row['username'] . '&nbsp;[hidden]';
				}
				
				global $phpbb_root_path, $phpEx;
				if (!isset($online_users['hidden_users'][$row['user_id']]) || $auth->acl_get('u_viewonline'))
				{
					if ( !function_exists('get_user_avatar'))
					{
						include($phpbb_root_path . 'includes/functions_display.' . $phpEx); 
					}
					
				
					$user_online_link = get_username_string(($row['user_type'] <> USER_IGNORE) ? 'profile' : 'no_profile', $row['user_id'], $row['username'], $row['user_colour']);
					
					$user_online_avatar = (empty($row['user_avatar']) || $row['user_type'] == USER_IGNORE ) ? '<img src="' . $phpbb_root_path . 'styles/' . $user->theme['imageset_path'] . '/theme/images/no_avatar.gif" height="' . $max_avatar_online_users . '" width="' . $max_avatar_online_users . '" title="'. $row['username'] . '" alt=""  />' : get_user_avatar($row['user_avatar'],$row['user_avatar_type'], $avatar_width_online_users, $avatar_height_online_users, $row['username']);
					
					
					$online_userlist .= ($online_userlist != '') ? '&nbsp; <a href="' . $user_online_link . '" title = "'. $row['username'] . '">' . $user_online_avatar . '</a>' : '<a href="' . $user_online_link . '" title = "'. $row['username'] . '">' . $user_online_avatar . '</a>';
				}
			}
		}
		$db->sql_freeresult($result);
	}

	if (!$online_userlist)
	{
		$online_userlist = $user->lang['NO_ONLINE_USERS'];
	}

	if ($forum_id === 0)
	{
		$online_userlist = $user->lang['REGISTERED_USERS'] . ' ' . $online_userlist;
	}
	else if ($config['load_online_guests'])
	{
		$l_online = ($online_users['guests_online'] === 1) ? $user->lang['BROWSING_FORUM_GUEST'] : $user->lang['BROWSING_FORUM_GUESTS'];
		$online_userlist = sprintf($l_online, $online_userlist, $online_users['guests_online']);
	}
	else
	{
		$online_userlist = sprintf($user->lang['BROWSING_FORUM'], $online_userlist);
	}
	// Build online listing
	$vars_online = array(
		'ONLINE'	=> array('total_online', 'l_t_user_s', 0),
		'REG'		=> array('visible_online', 'l_r_user_s', !$config['load_online_guests']),
		'HIDDEN'	=> array('hidden_online', 'l_h_user_s', $config['load_online_guests']),
		'GUEST'		=> array('guests_online', 'l_g_user_s', 0)
	);

	foreach ($vars_online as $l_prefix => $var_ary)
	{
		if ($var_ary[2])
		{
			$l_suffix = '_AND';
		}
		else
		{
			$l_suffix = '';
		}
		switch ($online_users[$var_ary[0]])
		{
			case 0:
				${$var_ary[1]} = $user->lang[$l_prefix . '_USERS_ZERO_TOTAL' . $l_suffix];
			break;

			case 1:
				${$var_ary[1]} = $user->lang[$l_prefix . '_USER_TOTAL' . $l_suffix];
			break;

			default:
				${$var_ary[1]} = $user->lang[$l_prefix . '_USERS_TOTAL' . $l_suffix];
			break;
		}
	}
	unset($vars_online);

	$l_online_users = sprintf($l_t_user_s, $online_users['total_online']);
	$l_online_users .= sprintf($l_r_user_s, $online_users['visible_online']);
	$l_online_users .= sprintf($l_h_user_s, $online_users['hidden_online']);

	if ($config['load_online_guests'])
	{
		$l_online_users .= sprintf($l_g_user_s, $online_users['guests_online']);
	}



	return array(
		'online_userlist'	=> $online_userlist,
		'l_online_users'	=> $l_online_users,
	);
}