session_create_id

PHP 7 >= 7.1.0, PHP 8

session_create_id - Create new session id

Code 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.
    $_SESSION['deleted_time'] = time();
    // Finish session
    session_commit();
    // Make sure to accept user defined session ID
    // NOTE: You must enable use_strict_mode for normal operations.
    ini_set('session.use_strict_mode', 0);
    // Set new custom session ID
    session_id($newid);
    // Start with custom 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

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session_create_id

Example #1 session_create_id example with session_regenerate_id

Function session_create_id:

Session Handling Functions

Most used PHP functions