3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1, 2, 3); foreach ($a as &$b) { echo $b, ' '; } echo "\n"; foreach ($a as $b) { echo $b, ' '; }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.29, 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 3 1 2 2

preferences:
229.99 ms | 405 KiB | 368 Q