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  1. <?php
  2.  
  3. $list = array(
  4.     array("id" => 1, "parentId" => null, "text" => "Первая строка"), 
  5.     array("id" => 2, "parentId" => 3,    "text" => "Вторая строка"), 
  6.     array("id" => 3, "parentId" => 1,    "text" => "Третья строка"),
  7.     array("id" => 4, "parentId" => 1,    "text" => "Четвертая строка"),
  8.     array("id" => 5, "parentId" => null, "text" => "Пятая строка"), 
  9.     array("id" => 6, "parentId" => 5,    "text" => "Шестая строка"), 
  10.     ["id" => 7, "parentId" => 6, "text" => "Седьмая строка"], 
  11.     ["id" => 8, "parentId" => 5, "text" =>  "Восьмая строка"],
  12. );
  13.  
  14. /*
  15.  * 1 -> 3 -> 2
  16.  *  \
  17.  *   -> 4
  18.  *
  19.  * 5 -> 6 -> 7
  20.  *  \
  21.  *   -> 8
  22.  */
  23.  
  24. $roots = array_filter($list, function ($node) {
  25.     return $node['parentId'] === null;
  26. });
  27.  
  28. $stack = array_map(function ($root) {
  29.     return [0, $root];
  30. }, $roots);
  31.  
  32. function visit($depth, $node) {
  33.     echo str_repeat('-', $depth) . $node['id'] . "\n";
  34. }
  35.  
  36. while (count($stack)) {
  37.     list($depth, $current) = array_shift($stack);
  38.  
  39.     visit($depth, $current);
  40.  
  41.     $currentChildren = array_filter($list, function ($node) use ($current) {
  42.         return $node['parentId'] === $current['id'];
  43.     });
  44.     $depthChildMap = array_map(function ($child) use ($depth) {
  45.         return [$depth + 1, $child];
  46.     }, $currentChildren);
  47.  
  48.     $stack = array_merge($depthChildMap, $stack);
  49. }
  50.  
Success #stdin #stdout 0s 82880KB
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Standard input is empty
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1
-3
--2
-4
5
-6
--7
-8
https://ideone.com/YKik59
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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