Administration Control Panel -> Users and Groups -> Custom profile fields
[Create new field]: antibot (Field identification: antibot, Field type: Numbers)
Display in user control panel: Yes
Display on registration screen: Yes
Required field: Yes
Field name: Anti-Bot check
Field description: 如果您不是机器人，请输入一个130到139之间的数字:
[Profile type specific options]
Lowest allowed number: 130
Highest allowed number: 139
没有用mod，目前为止好像有效，是俺搞完后做的记录，看不明白的可以问，

还有一个办法是使用初始发帖审核，可阻止垃圾帖泛滥，但不能应对注册，设置很简单：
Administration Control Panel -> General -> Post settings
Enable queued posts: Yes
默认的最大帖子数是3，也就是说，只有前3帖通过审核发表后，用户才能自由发帖。
否则你发了他也不显示。。。
注意这个是3.0.0以后版本才有的功能（3.0.0本身木有）

/*—————–[ Everything below this line. ]—————–*/

// PHPBB User Database Plugin. (Requires MySQL Database)
require_once ‘./extensions/Auth_phpbb.php’;

$wgAuth_Config = array(); // Clean.

$wgAuth_Config['WikiGroupName'] = ‘Wiki’; // Name of your PHPBB group
// users need to be a member
// of to use the wiki. (i.e. Wiki)

$wgAuth_Config['UseWikiGroup'] = true; // This tells the Plugin to require
// a user to be a member of the above
// phpBB group. (ie. wiki) Setting
// this to false will let any phpBB
// user edit the wiki.

$wgAuth_Config['UseExtDatabase'] = true; // This tells the plugin that the phpBB tables
// are in a different database then the wiki.
// The default settings is false.

/*-[NOTE: You only need the next four settings if you set $wgAuth_Config['UseExtDatabase'] to true.]-*/
// $wgAuth_Config['MySQL_Host'] = ‘host’; // phpBB MySQL Host Name.
// $wgAuth_Config['MySQL_Username'] = ‘username’; // phpBB MySQL Username.
// $wgAuth_Config['MySQL_Password'] = ‘password’; // phpBB MySQL Password.
// $wgAuth_Config['MySQL_Database'] = ‘database_name’; // phpBB MySQL Database Name.

$wgAuth_Config['UserTB'] = ‘phpbb_users’; // Name of your PHPBB user table. (i.e. phpbb_users)
$wgAuth_Config['GroupsTB'] = ‘phpbb_groups’; // Name of your PHPBB groups table. (i.e. phpbb_groups)
$wgAuth_Config['User_GroupTB'] = ‘phpbb_user_group’; // Name of your PHPBB user_group table. (i.e. phpbb_user_group)
$wgAuth_Config['PathToPHPBB'] = ‘../phpbb3/’; // Path from this file to your phpBB install.

// Local
$wgAuth_Config['LoginMessage'] = ‘You need a phpBB account to login.‘; // Localize this message.
$wgAuth_Config['NoWikiError'] = ‘You are not a member of the required phpBB group.’; // Localize this message.

$wgAuth = new Auth_phpBB($wgAuth_Config); // Auth_PHPBB Plugin.

然后还需要修改Auth_phpbb.php，查找

if (md5($password) == $faryMySQLResult['user_password'] && $this->isMemberOfWikiGroup($username))

替换为：

require_once $this->_PathToPHPBB . ‘includes/functions.php’;
if (phpbb_check_hash($password, $faryMySQLResult['user_password']) && $this->isMemberOfWikiGroup($username))

最后要到论坛上建立对应的用户组，并添加用户。

参考：
1 http://www.mediawiki.org/wiki/Extension:PHPBB/Users_Integration

Notice: in file /includes/functions_upload.php on line 580: mime_content_type() [function.mime-content-type]: can only process string or stream arguments

一直跟踪下来，发现这个$filename是一个空变量，应该是用$source_file这个变量。

create view svnauth (username,passwd,groups) as select users.username,users.user_password,groups.group_name from groups,user_group left join users on user_group.user_id=users.user_id where groups.group_name=”svn” and user_group.group_id=groups.group_id ;

然后在apache2的site文件里设置为：

Auth_MySQL_Encryption_Types PHP_MD5

这样就可以了，具体的操作还需要参考之前的文章：安装subversion: ssl+auth_mysql+mod_svn。

估计还需要mysql 5的支持，不知道mysql 4是否支持视图。

在RC1到RC2的升级中，可以进行自动的升级。从RC2之后，好像需要手工确认了，不知道这个改进是好还是不好。
同时，在RC4升级过程中，若你使用了其他语言包，需要注意更新对应的语言包，或者，根据这个帖子进行简单的修改。

dallas2 wrote:I don't know if this is the right thing to do, but in your language pack find common.php file and open it. In that file find:

'NEWEST_USER' => 'Our newest member <strong>%s%s%s</strong>',

(of course, this second line will be in your language). Remove two of those "%s%s%s" so that the final line looks like this:

'NEWEST_USER' => 'Our newest member <strong>%s</strong>',

This removes the error line for me.

cd myforum
sudo wget http://prdownloads.sourceforge.net/phpbb/phpBB-3.0.RC1_to_3.0.RC2.zip?download
sudo unzip phpBB-3.0RC1_to_3.0RC2.zip

然后进入install目录，选择upgrade就可以了。