3v4l.org

run code in 500+ PHP versions simultaneously
<?php class a { function foo() { echo __CLASS__; // a print get_class($this); // a or b } } class b extends a {} (new b)->foo();
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.6
ab

preferences:
34.19 ms | 844 KiB | 4 Q