PHPBB结合CAS在linux下配置时候出现有关问题，

PHPBB结合CAS在linux下配置时候出现问题，急急急。。
在linux下结合CAS时候出现问题，安装好mysql php apache tomcat ssl环境之后
按照在PHPBB中加入CASClient 的代码配置了下
in function.php

PHP code

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Add require($phpbb_root_path . 'includes/CAS.' . $phpEx);
Find (isset($_POST['login']))
Replace it with:
if(!$admin && CAS_ENABLE){ 
// initialize phpCAS 
phpCAS::client(CAS_VERSION_2_0, CAS_SERVER_HOSTNAME, CAS_SERVER_PORT, CAS_SERVER_APP_NAME); 
phpCAS::setNoCasServerValidation(); 
// force CAS authentication 
phpCAS::forceAuthentication(); 
} 
if (isset($_POST['login']) || (!$admin && CAS_ENABLE) )
Find $result = $auth->login($username, $password, $autologin, $viewonline, $admin);
Add the following code before it:
if(!$admin && CAS_ENABLE){ 
$username = phpCAS::getUser(); 
$password = ''; 
}

在In Auth.php

PHP code

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Add the following function:
function login_cas($username){ 
global $db; 
$sql = 'SELECT user_id, username, user_password, user_passchg, user_pass_convert, user_email, user_type, user_login_attempts FROM ' . USERS_TABLE 
. " WHERE username_clean = '" . $username . "'"; 
$result = $db->sql_query($sql); 
$row = $db->sql_fetchrow($result); 
$db->sql_freeresult($result); 

if (!$row) { 
return array( 
'status' => LOGIN_ERROR_USERNAME, 
'error_msg' => 'LOGIN_ERROR_USERNAME', 
'user_row' => array('user_id' => ANONYMOUS), 
); 
} 

if ($row['user_type'] == USER_INACTIVE || $row['user_type'] == USER_IGNORE) { 
return array( 
'status' => LOGIN_ERROR_ACTIVE, 
'error_msg' => 'ACTIVE_ERROR', 
'user_row' => $row, 
); 
} 

// Successful login... set user_login_attempts to zero... 
return array( 
'status' => LOGIN_SUCCESS, 
'error_msg' => false, 
'user_row' => $row, 
); 
}
Find $login = $method($username, $password);
Replace it with:
if(!$admin && CAS_ENABLE)    
$login = $this->login_cas($username);    
else    
$login = $method($username, $password);

In constants.php

PHP code

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Add the following constant value:
define('CAS_ENABLE', true); 
define('CAS_SERVER_HOSTNAME', 'localhost'); 
define('CAS_SERVER_PORT', 8443); 
define('CAS_SERVER_APP_NAME', 'cas');

在phpBB3论坛里面点击登录跳到CAS server 的公共登录界面，输入用户名密码登录
看见url上已经出现获得了ticket，但是页面显示出错误如下：

PHP code

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[phpBB Debug] PHP Notice: in file /includes/CAS/client.php on line 529: session_destroy() [function.session-destroy]: Trying to destroy uninitialized session
CAS Authentication failed!

You were not authenticated.

You may submit your request again by clicking here.

If the problem persists, you may contact the administrator of this site.
phpCAS ${phpcas.version} using server https://localhost:8443/cas/ (CAS 2.0)

完全弄不明白哪里出错了。忘高手帮我看看什么地方出现问题了。谢谢大家，这问题困扰我N久了。

------解决方案--------------------
顶起 等待
------解决方案--------------------
帮顶。学习。