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  1. <?php
  2.  
  3. $array = array(
  4.     'a' => array(
  5.         'b' => array(
  6.             'c' => 'val'
  7.         ),
  8.         'd' => 'val2'
  9.     ),
  10.     'e' => 'val3'
  11. );
  12.  
  13. var_dump(collapse($array));
  14.  
  15. function collapse($array)
  16. {
  17.     $result = array();
  18.     foreach ($array as $key => $val) {
  19.         if (is_array($val)) {
  20.             foreach (collapse($val) as $nested_key => $nested_val) {
  21.                 $result[$key . '.' . $nested_key] = $nested_val;
  22.             }
  23.         } else {
  24.             $result[$key] = $val;
  25.         }
  26.     }
  27.  
  28.     return $result;
  29. }
Success #stdin #stdout 0.02s 13112KB
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array(3) {
  ["a.b.c"]=>
  string(3) "val"
  ["a.d"]=>
  string(4) "val2"
  ["e"]=>
  string(4) "val3"
}
https://ideone.com/ieSZ6
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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