3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr1 = ['a' => '1','b' => 2]; $arr2 = ['h' => 'c','j' => '3']; $result = []; while ($arr1 && $arr2) { $result += array_splice($arr1, 0, 1) + array_splice($arr2, 0, 1); } $result += $arr1 + $arr2; var_export($result);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array ( 'a' => '1', 'h' => 'c', 'b' => 2, 'j' => '3', )

preferences:
123.77 ms | 406 KiB | 5 Q