php数组 组合排列 笛卡尔积

function Descartes()
{
$t = func_get_args();
if (func_num_args() == 1) {
return call_user_func_array(__FUNCTION__, $t[0]);
} $a = array_shift($t);
if (!is_array($a)) {
$a = array($a);
} $a = array_chunk($a, 1);
do {
$r = array();
$b = array_shift($t);
if (!is_array($b)) {
$b = array($b);
} foreach ($a as $p) {
foreach (array_chunk($b, 1) as $q) {
$r[] = array_merge($p, $q);
}
} $a = $r;
} while ($t);
return $r;
}$arr = [
['3101','3102','3103'],
['3201','3202'],
];$tmp = Descartes($arr);print_r($tmp);