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  1. <?php
  2.  
  3. $b = [[1,2],[2,3],[3,4]];
  4. $a = array(-1 => null);
  5.  
  6. $d= $a + array_map('array_reverse',$b);
  7.  
  8. print_r($d);
  9.  
  10. $e = call_user_func_array('array_map',$d);
  11. print_r($e);
  12.  
  13.  
  14. ?>
Success #stdin #stdout 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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Array
(
    [-1] => 
    [0] => Array
        (
            [0] => 2
            [1] => 1
        )

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

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

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

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

)
https://ideone.com/ES75XJ
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
secret

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