数组组装问题

Question

我有两个不定长数组arr1和arr2。想组装成一个新的数组res

Answer 1

不太会php 用js写的 应该通用的吧

var arr1 = [1,2,3];
            var arr2 = ['a','b','c','d'];
            var arr = [];
            arr1.forEach(i=>{
                arr2.forEach(j=>{
                    arr.push([i,j]);
                })
            })
            console.log(arr)

Answer 2

for

$a = [1,2,3];
$b = ['a','b','c','d'];

$res = [];
for($i = 0; $i < count($a); $i++)
{
    for($j = 0; $j < count($b); $j++)
    {
        $res[] = [$a[$i],$b[$j]];
    }
}
var_dump($res);