您可以简单地循环元素，将元素作为键分配给当前数组，然后继续处理子数组。

<?php

$array = ['test1', 'test2','test3', 'test4'];
$res = [];
$temp = &$res;
foreach($array as $val){
    $temp[$val] = [];
    $temp = &$temp[$val];
}
$temp[] = 45; // some fixed value
print_r($res);

Demo：https://3v4l.org/INfR2

var oneDarr=[1,2,3,4,5,6]   
Output : [[1,2,3],[4,5,6]]
let a = []
let temp = []
let dSize= 0
// let dataIn = false
let size= 4
for(let i = 0; i<oneDarr.length;i++){
dSize+=1
temp.push(oneDarr[i])

if(dSize === size || i === oneDarr.length-1)
{
 a.push(temp)
 temp = []
 dSize=0
 }
console.log("d",dSize)
 }
console.log(a)

此逻辑将适用于所有语言给予大小，并将一个数组转换为多维数组\