CODEWITHSUNDEEP
phpmultidimensional-arraysum
Sabharish
Sabharish

Reputation: 101

Sum all elements in each subarray of a 2d array

I've got the following 2d array and I want to sum all of the elements in each subarray.

Input:

$main_array = [
    [1, 2, 3],
    [2, 4, 5],
    [8, 4, 3]
]

Desired Result:

[6, 11, 15]

I tried the following code:

foreach ($main_array as $key => $value)
    $main_array[$key] = Array('1' => array_sum($value));
print_r($main_array);

But the array structure I got was:

Array 
( 
    [0] => Array 
    ( 
        [1] => 6 
    ) 
    [1] => Array 
    ( 
        [1] => 11
    ) 
    [2] => Array 
    ( 
        [1] => 15 
    ) 
)

Upvotes: 3

Views: 3542

Answers (3)

mickmackusa
mickmackusa

Reputation: 47900

Call array_sum() on every row in your input array. array_map() makes this operation expressive, concise, and doesn't require any new variables to be declared.

Code: (Demo)

$array = [
    [1, 2, 3],
    [2, 4, 5],
    [8, 4, 3],
];

var_export(array_map('array_sum', $array));

Output:

array (
  0 => 6,
  1 => 11,
  2 => 15,
)

Upvotes: 1

Vincent Ramdhanie
Vincent Ramdhanie

Reputation: 103135

Try this:

  foreach ($main_array as $key => $value)
     $main_array[$key] = array_sum($value);

That is, place the sum directly in the top level array.

Upvotes: 2

Muhammad Hasan Khan
Muhammad Hasan Khan

Reputation: 35136

When you're calling Array function you're explicitly making an array so you have to remove this from Array('1'=>array_sum($value));

This is how your code should look like

foreach ($main_array as $key => $value)
  $main_array[$key] = array_sum($value);

Upvotes: 6

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