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  1. <?php
  2. $array = array('key1' => 
  3.                 array('key11' => 
  4.                      array('key111' => 'value111', 
  5.                            'key112' => 'value112', 
  6.                            'key113' => 'value113',
  7.                           ),
  8.                  ),
  9.            );
  10.  
  11. function getKeys($array, $prefix='', $separator = '/') {
  12.   $return = array();
  13.   foreach($array as $key => $value) {
  14.     if (!is_array($value)) $return[] = $prefix . $key;
  15.     else $return = array_merge($return, getKeys($value, $prefix . $key . $separator, $separator));
  16.   }
  17.   return $return;
  18. }
  19.  
  20. $keys = getKeys($array, '', '#');
  21.  
  22. print_r($keys);
  23. ?>
Success #stdin #stdout 0.01s 20568KB
comments ()
stdin
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Standard input is empty
stdout
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Array
(
    [0] => key1#key11#key111
    [1] => key1#key11#key112
    [2] => key1#key11#key113
)
https://ideone.com/krU4Xn
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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