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  1. <?php
  2.  
  3.     $array = array(
  4.         'key1' => array(
  5.             'key11' => array(
  6.                 'key111' => 'value111', 
  7.                 'key112' => 'value112', 
  8.                 'key113' => 'value113',
  9.                 'key114' => array('A','B','C','D'), 
  10.             ),
  11.             'key12' => array(
  12.                 'key121' => 'value121', 
  13.                 'key122' => 'value122', 
  14.                 'key123' => 'value123',
  15.                 'key124' => array('A','B','C','D'), 
  16.             ),
  17.         ),
  18.         'key2' => array(
  19.             'key21' => array(
  20.                 'key211' => 'value111', 
  21.                 'key212' => 'value112', 
  22.                 'key213' => 'value113',
  23.                 'key214' => array('A','B','C','D'), 
  24.             ),
  25.         ),
  26.     );
  27.  
  28.     function remap_keys($input, $max_depth, $separator = '/', /* reserved */ $keychain = array(), /* reserved */ &$output = array())
  29.     {
  30.         foreach ($input as $key => $element)
  31.         {
  32.             $element_keychain = array_merge($keychain, (array)$key);
  33.             if (($max_depth > 1) && is_array($element))
  34.                 remap_keys($element, $max_depth -1, $separator, $element_keychain, $output);
  35.             else
  36.                 $output[implode($separator, $element_keychain)] = implode(',', (array)$element);
  37.         }
  38.         return $output;
  39.     }
  40.  
  41.     print_r(remap_keys($array, 3));
Success #stdin #stdout 0.01s 20520KB
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Standard input is empty
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Array
(
    [key1/key11/key111] => value111
    [key1/key11/key112] => value112
    [key1/key11/key113] => value113
    [key1/key11/key114] => A,B,C,D
    [key1/key12/key121] => value121
    [key1/key12/key122] => value122
    [key1/key12/key123] => value123
    [key1/key12/key124] => A,B,C,D
    [key2/key21/key211] => value111
    [key2/key21/key212] => value112
    [key2/key21/key213] => value113
    [key2/key21/key214] => A,B,C,D
)
https://ideone.com/pqH45h
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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