3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i = 0; for($f = 0; $f <= 20; $f++) { echo "F".$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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.4, 8.3.6
F0 = 0 F1 = 2 F2 = 4 F3 = 6 F4 = 8 F5 = 10 F6 = 12 F7 = 14 F8 = 16 F9 = 18 F10 = 20 F11 = 22 F12 = 24 F13 = 26 F14 = 28 F15 = 30 F16 = 32 F17 = 34 F18 = 36 F19 = 38 F20 = 40
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 F0 = 0 F1 = 2 F2 = 4 F3 = 6 F4 = 8 F5 = 10 F6 = 12 F7 = 14 F8 = 16 F9 = 18 F10 = 20 F11 = 22 F12 = 24 F13 = 26 F14 = 28 F15 = 30 F16 = 32 F17 = 34 F18 = 36 F19 = 38 F20 = 40

preferences:
219.89 ms | 402 KiB | 354 Q