在PHP中组合和添加数组值

Question

I have an array structured like this:

Array
(
    [0] => Array
        (
            [0] => cmi.interactions.0.result
            [1] => 1
            [2] => 0
        )

    [1] => Array
        (
            [0] => cmi.interactions.0.result
            [1] => 0
            [2] => 1
        )

    [2] => Array
        (
            [0] => cmi.interactions.0.result
            [1] => 0
            [2] => 1
        )

    [3] => Array
        (
            [0] => cmi.interactions.1.result
            [1] => 1
            [2] => 0
        )

    [4] => Array
        (
            [0] => cmi.interactions.1.result
            [1] => 1
            [2] => 0
        )

    [5] => Array
        (
            [0] => cmi.interactions.1.result
            [1] => 1
            [2] => 0
        )
)

What I would like is the following:

Array
(
    [0] => Array
        (
            [0] => cmi.interactions.0.result
            [1] => 1
            [2] => 2
        )

    [1] => Array
        (
            [0] => cmi.interactions.1.result
            [1] => 3
            [2] => 0
        )
)

Basically I want to know how to find where the first value in each subarray match and add the second and third value accordingly?

Answer 1

Something like this, did not check it

$out = array();
foreach($arr as $el)
  if (!isset($out[$el[0]]))
     $out[$el[0]] = $el;
  else
     for($i = 1; $i < count($el); $i++)
        $out[$el[0]][$i] += $el[$i];

You can remove keys after that, like $out = array_values($out);