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  1. <?php
  2.  
  3. class Document
  4. {
  5.  
  6.     private $_children = [];
  7.  
  8.     public function parentLevel ()
  9.     {
  10.         $level = 0;
  11.  
  12.         if ($this->hasChildren())
  13.         {
  14.             $childrenLevels = [];
  15.  
  16.             foreach($this->children() as $child)
  17.             {
  18.                 $childrenLevels[] = $child->parentLevel();
  19.             }
  20.  
  21.             $level = max($childrenLevels) + 1;
  22.         }
  23.  
  24.         return $level;
  25.     }
  26.  
  27.     public function children ()
  28.     {
  29.         return $this->_children;
  30.     }
  31.  
  32.     public function hasChildren ()
  33.     {
  34.         return (count($this->_children) > 0);
  35.     }
  36.  
  37.     public function addChild ($child)
  38.     {
  39.         $this->_children[] = $child;
  40.     }
  41.  
  42. }
  43.  
  44. $doc1 = new Document();
  45. $doc2 = new Document();
  46. $doc3 = new Document();
  47. $doc4 = new Document();
  48. $doc5 = new Document();
  49. $doc6 = new Document();
  50. $doc7 = new Document();
  51.  
  52. $doc1->addChild($doc2);
  53. $doc1->addChild($doc3);
  54. $doc1->addChild($doc4);
  55.  
  56. $doc2->addChild($doc5);
  57. $doc2->addChild($doc6);
  58.  
  59. $doc5->addChild($doc7);
  60.  
  61. echo $doc1->parentLevel(), PHP_EOL;
Success #stdin #stdout 0.01s 82880KB
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https://ideone.com/6L6vU0
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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