3v4l.org

run code in 300+ PHP versions simultaneously
<?php class hi { function __wakeup() { echo 'haha'; } function __destruct() { echo 'hi'; } } $str = '!'; session_start(); $_SESSION[$str] = '|O:2:"hi":0:{}'; var_dump($_SESSION);

preferences:
37.15 ms | 402 KiB | 5 Q