3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1, 2, 3, 4]; foreach (1 ? $a : [] as &$x) { $x += 10; } print_r($a);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Array ( [0] => 11 [1] => 12 [2] => 13 [3] => 14 )
preferences:
212.58 ms | 402 KiB | 293 Q