3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('1', '2', '3', '4', '5'); foreach($a as $b) { echo $b.' - '; echo next($a).' - '; echo $b."\n"; }
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 - 5.2.3, 7.0.0 - 7.0.20, 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
1 - 2 - 1 2 - 3 - 2 3 - 4 - 3 4 - 5 - 4 5 - - 5
Output for 5.2.4 - 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
1 - 3 - 1 2 - 4 - 2 3 - 5 - 3 4 - - 4 5 - - 5
preferences:
296.87 ms | 402 KiB | 384 Q