3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_SESSION['foo'] = 'bar'; $_session['foo'] = 'not bar'; var_dump($_SESSION, $_session);
Output for 7.1.25 - 7.1.31, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array(1) { ["foo"]=> string(3) "bar" } array(1) { ["foo"]=> string(7) "not bar" }
preferences:
141.51 ms | 411 KiB | 6 Q