3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo '== Alphabets ==' . PHP_EOL; $s = 'W'; for ($n=2; $n<6; $n++) { echo ++$s . PHP_EOL; }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.3.7
== Alphabets == X Y Z AA
preferences:
253.02 ms | 404 KiB | 294 Q