00 Votes

PHP: Add previous sub-array value to next sub-array value

Question by Guest | 2022-08-20 at 16:45

In each sub-array's end element, I want to add the previous sub-array's end-element.

$arr = [ [1,2,4], [4,2,6], [2,1,8] ];

How can I do that with for-iteration?

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00 Votes

You mean something like that?

$arr = [ [1,2,4], [4,2,6], [2,1,8] ];

for ($i = 1; $i < count($arr); $i++) {
   $arr[$i-1][2] += $arr[$i][2];
}

// Result: [ [1,2,10], [4,2,14], [2,1,8] ]

Or should it be more flexible?
2022-08-20 at 22:57

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