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  1. <?php
  2.  
  3. function array_concatenate($array, $keys){
  4.     if(count($keys) === 0){
  5.         return array("This is this tree's last child");
  6.     }
  7.     $key = array_shift($keys);
  8.     $array[$key] = array_concatenate($array[$key], $keys); //recursive call
  9.     return $array;
  10. }
  11.  
  12. $result = [];
  13. $dynamic_columns = [];
  14. for($i = 97;$i < (97 + 26); $i++){
  15.     $dynamic_columns[] = chr($i); 
  16. }
  17.  
  18. if(!empty($dynamic_columns)){
  19.     $result =array_concatenate($result, $dynamic_columns);
  20.  
  21. }
  22. // echo '<pre>';
  23. print_r($result);
Success #stdin #stdout #stderr 0.02s 24452KB
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stdin
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Standard input is empty
stdout
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Array
(
    [a] => Array
        (
            [b] => Array
                (
                    [c] => Array
                        (
                            [d] => Array
                                (
                                    [e] => Array
                                        (
                                            [f] => Array
                                                (
                                                    [g] => Array
                                                        (
                                                            [h] => Array
                                                                (
                                                                    [i] => Array
                                                                        (
                                                                            [j] => Array
                                                                                (
                                                                                    [k] => Array
                                                                                        (
                                                                                            [l] => Array
                                                                                                (
                                                                                                    [m] => Array
                                                                                                        (
                                                                                                            [n] => Array
                                                                                                                (
                                                                                                                    [o] => Array
                                                                                                                        (
                                                                                                                            [p] => Array
                                                                                                                                (
                                                                                                                                    [q] => Array
                                                                                                                                        (
                                                                                                                                            [r] => Array
                                                                                                                                                (
                                                                                                                                                    [s] => Array
                                                                                                                                                        (
                                                                                                                                                            [t] => Array
                                                                                                                                                                (
                                                                                                                                                                    [u] => Array
                                                                                                                                                                        (
                                                                                                                                                                            [v] => Array
                                                                                                                                                                                (
                                                                                                                                                                                    [w] => Array
                                                                                                                                                                                        (
                                                                                                                                                                                            [x] => Array
                                                                                                                                                                                                (
                                                                                                                                                                                                    [y] => Array
                                                                                                                                                                                                        (
                                                                                                                                                                                                            [z] => Array
                                                                                                                                                                                                                (
                                                                                                                                                                                                                    [0] => This is this tree's last child
                                                                                                                                                                                                                )

                                                                                                                                                                                                        )

                                                                                                                                                                                                )

                                                                                                                                                                                        )

                                                                                                                                                                                )

                                                                                                                                                                        )

                                                                                                                                                                )

                                                                                                                                                        )

                                                                                                                                                )

                                                                                                                                        )

                                                                                                                                )

                                                                                                                        )

                                                                                                                )

                                                                                                        )

                                                                                                )

                                                                                        )

                                                                                )

                                                                        )

                                                                )

                                                        )

                                                )

                                        )

                                )

                        )

                )

        )

)
stderr
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PHP Notice:  Undefined index: a in /home/9ResiF/prog.php on line 8
https://ideone.com/y5iefD
language:
PHP (php 7.3.5)
created:
4 years ago
visibility:
public

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