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  1. <?php
  2.  
  3.  
  4. $all_cats = [
  5. 	[
  6. 		'id' => 7,
  7. 		'parent_id' => 6,
  8. 		'name' => 'Category 7 level 4'
  9. 	],
  10. 	[
  11. 		'id' => 0,
  12. 		'parent_id' => -1,
  13. 		'name' => 'Category 0 level 0'
  14. 	],
  15. 	[
  16. 		'id' => 1,
  17. 		'parent_id' => 0,
  18. 		'name' => 'Category 1 level 1'
  19. 	],
  20. 	[
  21. 		'id' => 2,
  22. 		'parent_id' => 0,
  23. 		'name' => 'Category 2 level 1'
  24. 	],
  25. 	[
  26. 		'id' => 3,
  27. 		'parent_id' => 0,
  28. 		'name' => 'Category 3 level 1'
  29. 	],
  30. 	[
  31. 		'id' => 4,
  32. 		'parent_id' => 2,
  33. 		'name' => 'Category 4 level 2'
  34. 	],
  35. 	[
  36. 		'id' => 5,
  37. 		'parent_id' => 2,
  38. 		'name' => 'Category 5 level 2'
  39. 	],
  40. 	[
  41. 		'id' => 6,
  42. 		'parent_id' => 5,
  43. 		'name' => 'Category 5 level 3'
  44. 	],
  45. ];
  46.  
  47.  
  48.  
  49. function get_cat_recursive($id_check, $array_check, $array_temp, $use_merge)
  50. {
  51.  
  52.   foreach ($array_check as $key => $value) {
  53.  
  54.     if ( $id_check == $value['parent_id']) {
  55.  
  56.       array_push($array_temp, $value['id']);
  57.       $new_array = get_cat_recursive($value['id'], $array_check, $array_temp, $use_merge);
  58.       if ($use_merge) {
  59. 		  $array_temp = array_merge($array_temp, $new_array);
  60. 	  } else {
  61. 		  $array_temp += $new_array;
  62. 	  }
  63.  
  64.     }
  65.  
  66.   }
  67.   return $array_temp;
  68.  
  69. }
  70.  
  71.  
  72. echo "With plus:\n";
  73. $result = get_cat_recursive(2, $all_cats, [], false);
  74. print_r($result);
  75.  
  76. echo "\n\nWith array_merge:\n";
  77. $result = get_cat_recursive(2, $all_cats, [], true);
  78. print_r($result);
  79.  
Success #stdin #stdout 0s 82560KB
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Standard input is empty
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With plus:
Array
(
    [0] => 4
    [1] => 5
    [2] => 6
    [3] => 7
)


With array_merge:
Array
(
    [0] => 4
    [1] => 4
    [2] => 5
    [3] => 4
    [4] => 4
    [5] => 5
    [6] => 6
    [7] => 4
    [8] => 4
    [9] => 5
    [10] => 6
    [11] => 7
    [12] => 4
    [13] => 4
    [14] => 5
    [15] => 6
    [16] => 7
)
https://ideone.com/UIGSkU
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
secret

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