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  1. <?php
  2.  
  3. function F($n){for($c=$n?[--$n]:[];~$n&&$n--;$c=[$n,$c]);return$c;}
  4.  
  5. var_dump(F(0),F(1),F(6));
Success #stdin #stdout 0.01s 24400KB
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Standard input is empty
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array(0) {
}
array(1) {
  [0]=>
  int(0)
}
array(2) {
  [0]=>
  int(0)
  [1]=>
  array(2) {
    [0]=>
    int(1)
    [1]=>
    array(2) {
      [0]=>
      int(2)
      [1]=>
      array(2) {
        [0]=>
        int(3)
        [1]=>
        array(2) {
          [0]=>
          int(4)
          [1]=>
          array(1) {
            [0]=>
            int(5)
          }
        }
      }
    }
  }
}
https://ideone.com/42L35E
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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