求商品SKU的所有组合（笛卡尔积）-js和php实现版

/**
 * 组合多个数组
 * @param  {...Array} arrays 
 * @returns 
 */
function combine(...arrays) {
  let list = [];
  let helper = function (index, prev) {
    // 当前数组
    let array = arrays[index];
    // 是否为最后一个数组
    let is_last = arrays.length - 1 == index;
    for (let item of array) {
      let current = prev.concat(item);
      if (is_last) {
        list.push(current);
      } else {
        helper(index + 1, current);
      }
    }
  };
  helper(0, []);
  return list;
}
let names = ['iPhone X', 'iPhone XS'];
let colors = ['黑色', '白色'];
let storages = ['64g', '256g'];
console.log(combine(names, colors, storages));

[
  [ 'iPhone X', '黑色', '64g' ],
  [ 'iPhone X', '黑色', '256g' ],
  [ 'iPhone X', '白色', '64g' ],
  [ 'iPhone X', '白色', '256g' ],
  [ 'iPhone XS', '黑色', '64g' ],
  [ 'iPhone XS', '黑色', '256g' ],
  [ 'iPhone XS', '白色', '64g' ],
  [ 'iPhone XS', '白色', '256g' ]
]

<?php
function helper($index, $prev, $arrays, & $list)
{
    // 当前数组
    $array = $arrays[$index];
    // 是否为最后一个数组
    $is_last = count($arrays) - 1 == $index;
    foreach ($array as $item) {
        $current = $prev;
        $current[] = $item;
        if ($is_last) {
            $list[] = $current;
        } else {
            helper($index + 1, $current, $arrays, $list);
        }
    }
}
function combine(...$arrays)
{
    $list = [];
    helper(0, [], $arrays, $list);
    return $list;
}
$names = ['iPhone X', 'iPhone XS'];
$colors = ['黑色', '白色'];
$storages = ['64g', '256g'];
echo json_encode(combine($names, $colors, $storages), JSON_PRETTY_PRINT|JSON_UNESCAPED_UNICODE);

[
    ["iPhone X", "黑色", "64g"],
    ["iPhone X", "黑色", "256g"],
    ["iPhone X", "白色", "64g"],
    ["iPhone X", "白色", "256g"],
    [ "iPhone XS", "黑色", "64g"],
    [ "iPhone XS", "黑色", "256g"],
    [ "iPhone XS", "白色", "64g"],
    [ "iPhone XS", "白色", "256g"]
]