Level 61
$sum = collect($matrix)->flatten()->sum();
Sep 16, 2021
4
Level 2
Sum of array
$matrix = array( [1,2,3,4,5,6,8], [1,2,3,4,5,6,2], [1,2,3,4,5,6,1], [1,2,3,4,5,6,3] );
sum of array
[1,2,3,4,5,6,8], [2,3,4,5,6], [3,4,5] [4]
like sum this
Level 61
Or if you need them by "subarray" then:
$sums = collect($matrix)->map(fn(array $items): int => array_sum($items));
Level 55
@asadbek2000 what?
Level 28
Your question is rather vague. What exactly do you expect? Do you expect that your $matrix ends up with the content [1,2,3,4,5,6,8], [2,3,4,5,6], [3,4,5], [4] or are you looking for a single number which is the sum of an array of array?
If you're looking for a sum of all numbers in the subarrays, you can use this logic:
$sum = array_sum(array_merge(...$matrix));
Basically, you merge all your inner arrays into one and sum the content of the resulting array. Of course, that only works with automatically assigned/integer array keys (which is what you show in your example), not string keys, because they can collide during the merge (some data would be lost).
What would work with colliding string keys (using Laravel's Arr class):
$sum = array_sum(Arr::flatten($matrix));
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