3v4l.org

run code in 300+ PHP versions simultaneously
<?php for($f = 0; $f <= 20; $f++) { $i = 0; echo "F".$i." = ".($i+$f)."\n"; $i++; }
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, 5.5.0 - 5.5.38, 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 - 8.2.18, 8.3.0 - 8.3.6
F0 = 0 F0 = 1 F0 = 2 F0 = 3 F0 = 4 F0 = 5 F0 = 6 F0 = 7 F0 = 8 F0 = 9 F0 = 10 F0 = 11 F0 = 12 F0 = 13 F0 = 14 F0 = 15 F0 = 16 F0 = 17 F0 = 18 F0 = 19 F0 = 20
preferences:
304.56 ms | 406 KiB | 459 Q