CODEWITHSUNDEEP
phparrayssplit
Rushvanth Bhaskar
Rushvanth Bhaskar

Reputation: 23

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

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.

Upvotes: 2

Views: 8160

Answers (3)

X 47 48 - IR
X 47 48 - IR

Reputation: 1488

Here you go

function SplitLike($array, $groups)
{
   $result = [];
   $left = count($array);
   foreach ($groups as $i => $group) {
       $result[$i] = array_slice($array, count($array) - $left, $group);
       $left -= $group;
   }
   return $result;
}

Upvotes: 0

Progrock
Progrock

Reputation: 7485

<?php

$input      = range(1,11);
$chunk_size = 3;
$output     = array_chunk($input, $chunk_size);

// If we can't chunk into equal sized parts merge the last two arrays.
if(count($input) % $chunk_size) {
    $leftovers = array_pop($output);
    $last      = array_pop($output);
    array_push($output, array_merge($last, $leftovers));
}

var_export($output);

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,
    4 => 11,
  ),
)

Upvotes: 2

Narendrasingh Sisodia
Narendrasingh Sisodia

Reputation: 21437

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
        )

)

Upvotes: 6

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