$a = array("a","b","c");
$b = array("1","2","3");
//组成
// a-1 a-2 a-3
// b-1 b-2 b-3
// c-1 c-2 c-3
//我们会
$arr = [];
foreach ($a as $k=>$v){
foreach($b as $vv){
$arr[]= $v.'-'.$vv;
}
}
//问题来了，如果我们n个数组组合呢,
//$a = array("a","b","c");
//$b = array("1","2","3");
//$c = ...
//$d = ... 最佳答案
