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  1. <?php
  2.  
  3. function f($a){return$a?array_merge(array_shift($a),f(array_reverse($a?next($a)?array_map(null,...$a):array_chunk($a[0],1):$a))):$a;}
  4.  
  5. print_r(array_map('f', [
  6.     [], 
  7.     [[1]], 
  8.     [[1, 2], [4, 3]], 
  9.     [[1, 2, 3], [8, 9, 4], [7, 6, 5]], 
  10.     [[1, 2, 3, 4], [12, 13, 14, 5], [11, 16, 15, 6], [10, 9, 8, 7]], 
  11.     [[1, 2, 3, 4], [10, 11, 12, 5],[9, 8, 7, 6]] 
  12. ]));
Success #stdin #stdout 0s 82560KB
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Standard input is empty
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Array
(
    [0] => Array
        (
        )

    [1] => Array
        (
            [0] => 1
        )

    [2] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
        )

    [3] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
            [4] => 5
            [5] => 6
            [6] => 7
            [7] => 8
            [8] => 9
        )

    [4] => 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] => 15
            [15] => 16
        )

    [5] => 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/jtk9Wp
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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