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  1. <?php
  2.  
  3. 	$comments = [
  4. 		'2020-01-08 20:40:00'=>[
  5. 			id=>1,
  6. 			parent_id=>0,
  7. 			comment_text=>'1',
  8. 			date_posted=>'2020-01-08 20:40:00',
  9. 		],
  10. 		'2020-01-08 20:41:00'=>[
  11. 			id=>2,
  12. 			parent_id=>1,
  13. 			comment_text=>'1.1',
  14. 			date_posted=>'2020-01-08 20:41:00',
  15. 		],
  16. 		'2020-01-08 20:42:00'=>[
  17. 			id=>3,
  18. 			parent_id=>0,
  19. 			comment_text=>'2',
  20. 			date_posted=>'2020-01-08 20:42:00',
  21. 		],
  22. 		'2020-01-08 20:43:00'=>[
  23. 			id=>4,
  24. 			parent_id=>0,
  25. 			comment_text=>'3',
  26. 			date_posted=>'2020-01-08 20:43:00',
  27. 		],
  28. 		'2020-01-08 20:44:00'=>[
  29. 			id=>5,
  30. 			parent_id=>3,
  31. 			comment_text=>'2.1',
  32. 			date_posted=>'2020-01-08 20:44:00',
  33. 		],
  34. 		'2020-01-08 20:45:00'=>[
  35. 			id=>6,
  36. 			parent_id=>2,
  37. 			comment_text=>'1.1.1',
  38. 			date_posted=>'2020-01-08 20:45:00',
  39. 		],
  40. 		'2020-01-08 20:46:00'=>[
  41. 			id=>7,
  42. 			parent_id=>1,
  43. 			comment_text=>'1.2',
  44. 			date_posted=>'2020-01-08 20:46:00',
  45. 		],
  46. 	];
  47. 	krsort($comments);
  48.     $comment_hash = [];
  49.  
  50.     foreach($comments as $comment) {
  51.         if(!$comment_hash[$comment['parent_id']]) {
  52.             $comment_hash[$comment['parent_id']] = [];
  53.         }
  54.  
  55.         $comment_hash[$comment['parent_id']][] = $comment;
  56.     }
  57.  
  58.     function displayComments($comments, $comment_hash, $depth) {
  59.         foreach($comments as $comment) {
  60. 			print(str_repeat(' ', 4 * $depth));
  61.             print($comment['comment_text']);
  62.             print("\n");
  63.  
  64.             displayComments($comment_hash[$comment['id']], $comment_hash, $depth + 1);
  65.         }
  66.     }
  67.  
  68.     displayComments($comment_hash[0], $comment_hash, 0);
Success #stdin #stdout #stderr 0.02s 24660KB
comments (?)
stdin
copy 
Standard input is empty
stdout
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3
2
    2.1
1
    1.2
    1.1
        1.1.1
stderr
copy 
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 5
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 6
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 7
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 8
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 11
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 12
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 13
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 14
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 17
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 18
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 19
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 20
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 23
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 24
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 25
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 26
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 29
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 30
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 31
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 32
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 35
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 36
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 37
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 38
PHP Warning:  Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 41
PHP Warning:  Use of undefined constant parent_id - assumed 'parent_id' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 42
PHP Warning:  Use of undefined constant comment_text - assumed 'comment_text' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 43
PHP Warning:  Use of undefined constant date_posted - assumed 'date_posted' (this will throw an Error in a future version of PHP) in /home/yykYru/prog.php on line 44
PHP Notice:  Undefined offset: 1 in /home/yykYru/prog.php on line 51
PHP Notice:  Undefined offset: 2 in /home/yykYru/prog.php on line 51
PHP Notice:  Undefined offset: 3 in /home/yykYru/prog.php on line 51
PHP Notice:  Undefined offset: 0 in /home/yykYru/prog.php on line 51
PHP Notice:  Undefined offset: 4 in /home/yykYru/prog.php on line 64
PHP Warning:  Invalid argument supplied for foreach() in /home/yykYru/prog.php on line 59
PHP Notice:  Undefined offset: 5 in /home/yykYru/prog.php on line 64
PHP Warning:  Invalid argument supplied for foreach() in /home/yykYru/prog.php on line 59
PHP Notice:  Undefined offset: 7 in /home/yykYru/prog.php on line 64
PHP Warning:  Invalid argument supplied for foreach() in /home/yykYru/prog.php on line 59
PHP Notice:  Undefined offset: 6 in /home/yykYru/prog.php on line 64
PHP Warning:  Invalid argument supplied for foreach() in /home/yykYru/prog.php on line 59
https://ideone.com/DXxx7m
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
secret

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