3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "test\0test"; var_dump($$a);
Output for 8.4.1 - 8.4.12
Warning: Undefined variable $testtest in /in/vSKAO on line 5 NULL
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25
Warning: Undefined variable $test in /in/vSKAO on line 5 NULL
preferences:
61.59 ms | 407 KiB | 5 Q