An array of cumulative sums?

HI, I met a demand, and now there are arrays

$old=[1,2,3]

Required output

$new=[1,3,6]

In other words: The new output array of each item n, is the corresponding old array of the first n and (including n), then, what is the good way?

PS: code can be better elegant

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HI, I met a demand, and now there are arrays

$old=[1,2,3]

Required output

$new=[1,3,6]

In other words: The new output array of each item n, is the corresponding old array of the first n and (including n), then, what is the good way?

PS: code can be better elegant

var arr = [1, 2, 3, 4, 5];var newArr = [];arr.reduce(function (prev, next) {    newArr.push(prev + next);    return prev + next;}, 0);

PHP find the appropriate reduce method

Written in PHP, feel a bit stupid, not elegant

$arr = array(1,2,3,4,5,6);$arr1 = array();foreach ($arr as $key=>$val) {    $arr2 = array_slice($arr, 0, $key+1);    $arr1[] = array_reduce($arr2, function($v, $w){        $v += $w;        return $v;    });}print_r($arr1);

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