3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = array('foo', 'bar', 'boom'); foreach ($input as $row) { echo $row, "\n"; echo 'N: ', next($input), "\n"; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 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 - 8.3.6
foo N: bar bar N: boom boom N:
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
foo N: boom bar N: boom N:
preferences:
195.54 ms | 402 KiB | 227 Q