Question

Is it possible to assign session_id() a new value manually?

I’ve tried the following but it’s not working:

session_start();
$sessionId = session_id();
echo $sessionId;

if ($sessionId != $ses) { 
session_id() = $ses;
}

Answer 1

You can using session_id():

session_id($sessionId);

session_id() can be used to either get the session ID or set it by passing in an optional function argument as I have done above.

It is worth noting the following from the manual with regard function call order and session ID character restrictions:

If id is specified, it will replace the current session id.
session_id() needs to be called before session_start() for that
purpose. Depending on the session handler, not all characters are
allowed within the session id. For example, the file session handler
only allows characters in the range a-z A-Z 0-9 , (comma) and –
(minus)!