Question

I have an array that looks like this

Array ( 

[0] => Array
        (
            [id] => 123
            [count] => 1
        )

    [1] => Array
        (
            [id] => 123
            [count] => 3
        )

    [2] => Array
        (
            [id] => 513
            [count] => 0
        )
    [3] => Array
        (
             [id] => 561
             [count] => 1
         )
     [4] => Array
         (
              [id] => 613
              [count] => 7
         )

)

What I want to do is create a new array, that totals the count where the id values are the same. So for example, the new array would look like this:

Array ( 

[0] => Array
        (
            [id] => 123
            [count] => 4
        )

    [1] => Array
        (
            [id] => 513
            [count] => 0
        )
    [2] => Array
        (
             [id] => 561
             [count] => 1
         )
     [3] => Array
         (
              [id] => 613
              [count] => 7
         )

)

Would anyone know a good method to do this?

Thank you!

Answer 1

Short and simple:

$new_array = array();

foreach($data_array as $value) {
    if(array_key_exists($value['id'], $new_array)) {
        $new_array[$value['id']] += $value['count'];
    } else {
        $new_array[$value['id']] = $value['count'];
    }
}

echo print_r($new_array,true);

I made it id => value since there didn’t seem to need another array for data when the id could be used as the array’s key.