会话ID太长或包含非法字符，有效字符为a-z，A-Z，0-9和'-'

问题描述：

如何解决:

警告:session_start()[function.session-start]:会话ID太长或包含非法字符，有效字符为在线.....中的az，AZ，0-9和'-'. 3

Warning: session_start() [function.session-start]: The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in ..... on line 3

警告:session_start()[function.session-start]:无法发送会话cookie-第3行的.....中已经由发送者发送的头文件(输出从......:3开始)

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at ......:3) in ..... on line 3

警告:session_start()[function.session-start]:无法发送会话缓存限制器-在第3行的.....中已发送的标头(输出从.....:3开始)

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at .....:3) in ..... on line 3

答

看看这个

have a look at this session_start() discussion for a work-around:

如果PHPSESSID包含非法字符，
session_start()会生成警告

session_start() generate a warning if PHPSESSID contains illegal characters

警告:session_start()[function.session-start]:会话ID包含非法字符，有效字符为/home/para/dev/mon/site/header中的az，AZ，0-9和'-'.第17行的php

Warning: session_start() [function.session-start]: The session id contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in /home/para/dev/mon_site/header.php on line 17

为避免我写了这个:

   <?php
        function my_session_start()
        {
            if (ini_get('session.use_cookies') && isset($_COOKIE['PHPSESSID'])) {
                $sessid = $_COOKIE['PHPSESSID'];
            } elseif (!ini_get('session.use_only_cookies') && isset($_GET['PHPSESSID'])) {
                $sessid = $_GET['PHPSESSID'];
            } else {
                session_start();
                return false;
            }

           if (!preg_match('/^[a-z0-9]{32}$/', $sessid)) {
                return false;
            }
            session_start();

           return true;
        }
    ?>

会话ID太长或包含非法字符，有效字符为a-z，A-Z，0-9和'-'

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