- array_splice: documentation ( source)
- var_export: documentation ( source)
<?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);