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  1. <?php
  2.  
  3.     function spiralmatrix($arr)
  4.     {
  5.     	return  $arr 
  6.     			? array_merge(
  7.     					array_shift($arr), 
  8.     					spiralmatrix(array_reverse(transpose($arr)))
  9.     			)
  10.     			: $arr;
  11.     }
  12.  
  13. function transpose($arr)
  14. { 
  15.     return count($arr) > 1 ? array_map(null, ...$arr) : $arr; 
  16. }
  17.  
  18. print_r(spiralmatrix([]));
  19. print_r(spiralmatrix([[1]]));
  20. print_r(spiralmatrix([[1,2],[4,3]]));
  21. print_r(spiralmatrix([[1,2,3],[8,9,4],[7,6,5]]));
  22. print_r(spiralmatrix([[1,2,3,4],[12,13,14,5],[11,16,15,6],[10,9,8,7]]));
  23. print_r(spiralmatrix([[1,2,3,4],[10,11,12,5],[9,8,7,6]]));
Success #stdin #stdout 0s 82560KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
)
Array
(
    [0] => 1
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 4
    [3] => 3
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 9
    [8] => 8
)
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
    [12] => 13
    [13] => 14
    [14] => 16
    [15] => 15
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 12
    [10] => 11
    [11] => 10
)
https://ideone.com/q5vsyu
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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