3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a1 = ['a' => 0, 'c' => 1, 'e' => 2]; $a2 = ['b' => 3, 'd' => 4, 'f' => 5]; $result = []; while($a1 && $a2) { $result += array_splice($a1, 0, 1) + array_splice($a2, 0, 1); } var_export($result);

preferences:
24.95 ms | 405 KiB | 5 Q