3v4l.org

run code in 300+ PHP versions simultaneously
<?php for($key=1; $key<=2; $key++){ echo $key; }
Output for 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
12

preferences:
39.77 ms | 406 KiB | 5 Q