<?php
function direct_product(array ...$arrays)
{
$result = [[]];
foreach ($result as $i => $x) {
foreach ($arrays as $j => $y) {
$result[$i][$j] = array_merge($x, [$y]);
}
}
return $result;
}
var_export(direct_product(['A', 'B', 'C'], ['a'], [1, 2]));
/*
array (
0 =>
array (
0 => 'A',
1 => 'a',
2 => 1,
),
1 =>
array (
0 => 'A',
1 => 'a',
2 => 2,
),
2 =>
array (
0 => 'B',
1 => 'a',
2 => 1,
),
3 =>
array (
0 => 'B',
1 => 'a',
2 => 2,
),
4 =>
array (
0 => 'C',
1 => 'a',
2 => 1,
),
5 =>
array (
0 => 'C',
1 => 'a',
2 => 2,
),
)
*/
var_export(direct_product(['A', 'B', 'C'], [], [1, 2]));
/*
array (
)
*/
preferences:
74.65 ms | 402 KiB | 5 Q