3v4l.org

run code in 300+ PHP versions simultaneously
<?php $elements = [1,2,3,4,5]; foreach ($elements as $k => &$item) { //.... } $another = [1,2,3,4,5]; foreach ($another as $k => $item) { $item++; } var_dump($elements);
Output for 5.6.0 - 5.6.25, 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 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> &int(6) }
preferences:
225.09 ms | 405 KiB | 233 Q