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  1. <?php
  2.  
  3. function diagonalSum($arr) {
  4.     $i = 0; 
  5.     $n = count($arr);
  6.     return array_reduce($arr, 
  7.         function  ($c, $str) use (&$i, $n ) {
  8.         $i++;
  9.         return $c + $str[$i-1] + $str[$n-$i];
  10.    }, 0);
  11. }
  12.  
  13. print(diagonalSum(
  14. [
  15. 	[1, 2, 3, 4],
  16. 	[5, 6, 7, 8],
  17. 	[9, 10, 11, 12],
  18. 	[13, 14, 15, 16],
  19. ])); // should be 68
Success #stdin #stdout 0s 82560KB
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68
https://ideone.com/aauMWI
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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