$arr = [
['1', '2', '3'],
['a', 'b', 'c'],
['A', 'B', 'C', 'D'],
];
$result = [];
foreach ($arr as $a) {
$result = foo($result, $a);
}
dump($result);
function foo($r, $arr)
{
$result = [];
if (!$r) {
foreach ($arr as $vv) {
$result[] = $vv;
}
}
foreach ($r as $v) {
foreach ($arr as $vv) {
$result[] = $v . ',' . $vv;
}
}
return $result;
}
结果
array:36 [▼
0 => "1,a,A"
1 => "1,a,B"
2 => "1,a,C"
3 => "1,a,D"
4 => "1,b,A"
5 => "1,b,B"
6 => "1,b,C"
7 => "1,b,D"
8 => "1,c,A"
9 => "1,c,B"
10 => "1,c,C"
11 => "1,c,D"
12 => "2,a,A"
13 => "2,a,B"
14 => "2,a,C"
15 => "2,a,D"
16 => "2,b,A"
17 => "2,b,B"
18 => "2,b,C"
19 => "2,b,D"
20 => "2,c,A"
21 => "2,c,B"
22 => "2,c,C"
23 => "2,c,D"
24 => "3,a,A"
25 => "3,a,B"
26 => "3,a,C"
27 => "3,a,D"
28 => "3,b,A"
29 => "3,b,B"
30 => "3,b,C"
31 => "3,b,D"
32 => "3,c,A"
33 => "3,c,B"
34 => "3,c,C"
35 => "3,c,D"
]