3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php for($f = 0; $f <= 20; $f++) { for($n = $f+1; $n <= 21; $n++) { Echo $n."\n"; } }
based on hL3XX
Output for 4.3.0 - 7.1.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 8 9 10 11 12 13 14 15 16 17 18 19 20 21 9 10 11 12 13 14 15 16 17 18 19 20 21 10 11 12 13 14 15 16 17 18 19 20 21 11 12 13 14 15 16 17 18 19 20 21 12 13 14 15 16 17 18 19 20 21 13 14 15 16 17 18 19 20 21 14 15 16 17 18 19 20 21 15 16 17 18 19 20 21 16 17 18 19 20 21 17 18 19 20 21 18 19 20 21 19 20 21 20 21 21