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  1. <?php
  2. function convert($arr) {
  3.     $ret = array();
  4.     foreach ($arr as $key => $value) {
  5.         if (is_array($value)) {
  6.             $ret[$key] = convert($value);
  7.         } else {
  8.             $ret[] = $key;
  9.         }
  10.     }
  11.     return $ret;
  12. }
  13. $test = array(
  14.     'key1' => array(
  15.         'key2' => array(
  16.             'key3' => 'val'
  17.         )
  18.     )
  19. );
  20. var_dump(convert($test));
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
array(1) {
  ["key1"]=>
  array(1) {
    ["key2"]=>
    array(1) {
      [0]=>
      string(4) "key3"
    }
  }
}
https://ideone.com/mOr486
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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