Question

How to solve :

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

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

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

Answer 1

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

session_start() generate a warning if PHPSESSID contains illegal characters

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

To avoid i wrote this :

   <?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;
        }
    ?>