session_create_id
Create new session id
Description
string session_create_id
([ string $prefix
] )
If session is not active, collision check is omitted.
Session ID is created according to php.ini settings.
It is important to use the same user ID of your web server for GC
task script. Otherwise, you may have permission problems especially
with files save handler.
Parameters
-
prefix
-
If prefix is specified, new session id
is prefixed by prefix. Not all
characters are allowed within the session id. Characters in
the range a-z A-Z 0-9 , (comma) and -
(minus) are allowed.
Return Values
session_create_id returns new collision free
session id for the current session. If it is used without active
session, it omits collision check.
Examples
Example #1 session_create_id example with session_regenerate_id
<?php
// My session start function support timestamp management
function my_session_start() {
session_start();
// Do not allow to use too old session ID
if (!empty($_SESSION['deleted_time']) && $_SESSION['deleted_time'] < time() - 180) {
session_destroy();
session_start();
}
}
// My session regenerate id function
function my_session_regenerate_id() {
// Call session_create_id() while session is active to
// make sure collision free.
if (session_status() != PHP_SESSION_ACTIVE) {
session_start();
}
// WARNING: Never use confidential strings for prefix!
$newid = session_create_id('myprefix-');
// Set deleted timestamp. Session data must not be deleted immediately for reasons.
$_SESSION['deleted_time'] = time();
// Finish session
session_commit();
// Make sure to accept user defined session ID
// NOTE: You must enable use_strict_mode for normal operations.
ini_set('session.use_strict_mode', 0);
// Set new custome session ID
session_id($newid);
// Start with custome session ID
session_start();
}
// Make sure use_strict_mode is enabled.
// use_strict_mode is mandatory for security reasons.
ini_set('session.use_strict_mode', 1);
my_session_start();
// Session ID must be regenerated when
// - User logged in
// - User logged out
// - Certain period has passed
my_session_regenerate_id();
// Write useful codes
?>