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  1. <?php
  2.  
  3. $old_arr = array(
  4.     0 => array(
  5.         'area_id' => 13,
  6.         'area' => '兵庫',
  7.     ),
  8.     1 => array(
  9.         'area_id' => 4,
  10.         'area' => '沖縄',
  11.     ),
  12.     2 => array(
  13.         'area_id' => 15,
  14.         'area' => '愛媛',
  15.     ),
  16.     3 => array(
  17.         0 => array(
  18.             'area_id' => 22,
  19.             'area' => '奈良',
  20.         ),
  21.         1 => array(
  22.             'area_id' => 3,
  23.             'area' => '群馬',
  24.         ),
  25.         2 => array(
  26.             'area_id' => 22,
  27.             'area' => '奈良',
  28.         ),
  29.         3 => array(
  30.             'area_id' => 22,
  31.             'area' => '奈良',
  32.         ),
  33.     ),
  34. );
  35.  
  36. $new_arr = array();
  37. array_walk_recursive($old_arr, function($v, $k) use (&$area_id, &$new_arr) {
  38.     $new_arr[$k === 'area_id' ? ($area_id = $v) : $area_id][$k] = $v;
  39. });
  40. $new_arr = array_values($new_arr);
  41.  
  42. print_r($new_arr);
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => Array
        (
            [area_id] => 13
            [area] => 兵庫
        )

    [1] => Array
        (
            [area_id] => 4
            [area] => 沖縄
        )

    [2] => Array
        (
            [area_id] => 15
            [area] => 愛媛
        )

    [3] => Array
        (
            [area_id] => 22
            [area] => 奈良
        )

    [4] => Array
        (
            [area_id] => 3
            [area] => 群馬
        )

)
https://ideone.com/cDMhqh
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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