fork download
copy 
  1. <?php
  2.  
  3. function transpose($array) 
  4. {
  5.     if (count($array) === 0) return $array;
  6. 	$out = [];
  7.     foreach ($array as  $rowkey => $row)
  8.     {
  9.         foreach($row as $colkey => $col)
  10.         {
  11.             $out[$colkey][$rowkey] = $col;
  12.         }
  13.     }
  14.  
  15.     return $out;
  16. }
  17.  
  18. function f($a)
  19. {
  20.     return (count($a) === 0) 
  21.     ? [] 
  22.     : array_merge(
  23.         array_shift($a), 
  24.         f(array_reverse(transpose($a)))
  25.     );
  26. }
  27.  
  28. print_r(f([[1,2,3,4],[10,11,12,5],[9,8,7,6]]));
Success #stdin #stdout 0.01s 82560KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 10
    [10] => 11
    [11] => 12
)
https://ideone.com/A06Y8z
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!