Split flat array into multiple arrays with specific counts dictated by another array of integers

Question

I have an array of dynamic length L1. I need to split this array into L2 number of arrays each having LEN[i] numbers from the original array.

Input arrays:

$array = [1,2,3,4,5,6,7,8,9,10]
    
$LEN = [3,3,4]

$LEN states how many elements each new array should contain. The 3 arrays will be:

$a1 = [1,2,3]

$a2 = [4,5,6]

$a3 = [7,8,9,10]

I have tried a lot of ways but nothing seems to be working. Any help would be greatly appreciated.

Answer 1

If you need such a variable array length of chunks then you can create your own functionality using simple foreach and array_splice like as

$array=[1,2,3,4,5,6,7,8,9,10];

$arr = [3,3,4];
$result_arr = [];
foreach($arr as $k => $v){
    $result_arr[$k] = array_splice($array,0,$v);
}
print_R($result_arr);

Output:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
        )

    [1] => Array
        (
            [0] => 4
            [1] => 5
            [2] => 6
        )

    [2] => Array
        (
            [0] => 7
            [1] => 8
            [2] => 9
            [3] => 10
        )

)