PHP中会话变量的确切用法是什么？ 它与会话ID有什么不同？ [关闭]

Question

<?php

session_start();

$_SESSION['name'] = 'Alex';

?>

Is a PHP session varriable the session ID ? if not , then what is the exact use of a session variable when we already have a unique session ID ??? Can someone please explain ? an example would help much !

Answer 1

PHP uses the SID to recreate $_SESSION from the session storage.