3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [0, 1, 2]; $ref =& $array; // Necessary to trigger the old behavior foreach ($array as $val) { var_dump($val); $array[1] = 'X'; } var_dump($ref);
Output for 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
int(0) int(1) int(2) array(3) { [0]=> int(0) [1]=> string(1) "X" [2]=> int(2) }
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
int(0) string(1) "X" int(2) array(3) { [0]=> int(0) [1]=> string(1) "X" [2]=> int(2) }
preferences:
202.28 ms | 402 KiB | 257 Q