session_create_id

    (PHP 7 >= 7.1.0, PHP 8)

    session_create_id — Create new session id

    Description

    session_create_id(string$prefix = ""): string|false

    session_create_id() is used to create new session id for the current session. It returns collision free session id.

    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. On failure, false is returned.

    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

    See Also

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