3v4l.org

run code in 300+ PHP versions simultaneously
<?php function actually_unset(&$var){ unset($var); gc_collect_cycles(); } class Foo{ function __destruct(){ echo "destruct "; } } $var = new Foo; actually_unset($var); echo "wat";
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
watdestruct

preferences:
200.07 ms | 404 KiB | 290 Q