3v4l.org

run code in 300+ PHP versions simultaneously
<?php function FUNTIK($key){ if ($key<5){ echo "0: $key\n"; $key++; FUNTIK($key); echo "KEY: $key\n"; } } FUNTIK(0); ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
0: 0 0: 1 0: 2 0: 3 0: 4 KEY: 5 KEY: 4 KEY: 3 KEY: 2 KEY: 1

preferences:
252.92 ms | 405 KiB | 337 Q