PHP遍历所有数组组合，用于商品SKU组合生成

<?php

function traverse_combinations(...$arrays) {
    $combinations = array();
    $traverse = function ($index, $current, $arrays) use (&$traverse, &$combinations) {
        if ($index == count($arrays)) {
            $combinations[] = $current;
        } else {
            $array = $arrays[$index];
            if (empty($array)) {
                $traverse($index + 1, $current, $arrays);
            } else {
                foreach ($array as $element) {
                    $current[] = $element;
                    $traverse($index + 1, $current, $arrays);
                    array_pop($current);
                }
            }
        }
    };
    $traverse(0, array(), $arrays);
    return $combinations;
}
//测试数据
$options = array(   
	"Color" => array("Red", "Blue", "Green","White"),   
	"Size" => array("S", "M", "L","XL"),   
);
$result = traverse_combinations(...array_values($options));
print_r($result);

//保持键名对应
$final_result = array();
foreach ($result as $combination) {
	$current = array();
	for ($i = 0; $i < count($combination); $i++) {
		$key = ucfirst(array_keys($options)[$i]);
		$current[$key] = $combination[$i];
	}
	$final_result[] = $current;
}
print_r($final_result);