The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,'

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-

Answer 1

I suggest to use "more correct" version of the function.

Several notes:

1. More correct regular expression (allows characters in the range a-z A-Z 0-9 , (comma) and - (minus)) as described here.
   Regular expression depends on the php ini settings, like described here and here.
2. Use session name method

So updated version looks like this:

<?php
    function my_session_start()
    {
        $sn = session_name();
        if (isset($_COOKIE[$sn])) {
            $sessid = $_COOKIE[$sn];
        } else if (isset($_GET[$sn])) {
            $sessid = $_GET[$sn];
        } else {
            session_start();
            return false;
        }

       if (!preg_match('/^[a-zA-Z0-9,\-]{22,40}$/', $sessid)) {
            return false;
        }
        session_start();

       return true;
    }
?>