我可以使用哪个php函数或函数组合来更新数组以获得下面的disired输出？

Current Array Output:

[0] => Array
    (
        [id] => 165       <-- first occurrence 
        [score] => 3.813   <-- first value
    )

[1] => Array
    (
        [id] => 167
        [score] => 3.772
    )

[2] => Array
    (
        [id] => 165  <-- second
        [score] => 4.421 <-- second value
    )

Desired Updated Array's Output after some php function:

[0] => Array
    (
        [id] => 165     <-- update this key 
        [score] => 8.234  <-- with $ary[0][score] + $ary[2][score]
    )

[1] => Array
    (
        [id] => 167
        [score] => 3.772
    )

Since the id key was updated we don't need the $ary[2][id] and $ary[2][score], so remove it.

Is there a magical function? or Should we write a special function to make this happen? Thanks!

For a general purpose function which tots up all of the records that share the same id value:

(NB: probably not idiomatic PHP, but it does work)

function totup($a) {

    // create temporary array keyed on ID, containining sum of scores
    $tmp = array();
    foreach ($a as $row) {
        $id = $row['id'];
        $score = $row['score'];
        $tmp[$id] += $score;
    }

    // then convert that array back to (id, score) tuples
    $res = array();
    foreach ($tmp as $id => $score) {
        $res[] = array(id => $id, score => $score);
    }
    return $res;
}

Test run:

$tmp = array(
    array(id => 165, score => 3.813),
    array(id => 167, score => 3.772),
    array(id => 165, score => 4.421));

$foo = totup($tmp);
print_r($foo);

Array
(
    [0] => Array
        (
            [id] => 165
            [score] => 8.234
        )

    [1] => Array
        (
            [id] => 167
            [score] => 3.772
        )

)

$ary[0][score] += $ary[2][score];
unset(yourArray[2]);