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  1. <?php
  2. 		$datas=array(
  3. 				array(
  4. 							'id' => 1,
  5. 							'title'=>'book1',
  6. 							'parentid'=>0
  7. 					),
  8. 				array(
  9. 							'id' => 2,
  10. 							'title'=>'book2',
  11. 							'parentid'=> 1
  12. 					),
  13. 				array(
  14. 							'id' => 3,
  15. 							'title'=>'book3',
  16. 							'parentid'=> 2
  17. 					),
  18.  
  19. 		);
  20.  
  21. 	function buildTree($data,$prID=0,$q=NULL){
  22. 				$branch = array();
  23. 				foreach ($data as $key => $element) {
  24. 					$bool=!array_key_exists($element['parentid'], $data) && !$q;
  25. 					if($element['parentid']==$prID || $bool){
  26. 						$children = buildTree($data, $element['id'],TRUE);
  27. 						if ($children) {
  28. 			                $element['children'] = $children;
  29. 			            }
  30. 			            $branch[] = $element;
  31. 					}
  32. 				}
  33. 				return $branch;
  34. 	}
  35.  
  36. 	function printTree($branch,$space=-1,$w=''){
  37.         $q=0;
  38.         if($w != ''){
  39.         	$w=$w.'-';
  40.         }
  41.         foreach ($branch as $value) {           
  42.             //$i=$space;
  43.  
  44.             $q++;
  45.             echo $w.$q.'-'.$value['title']."<br>";
  46.             if(isset($value['children']) && is_array($value['children'])){
  47.                 $i=$i++;
  48.                 printTree($value['children'],$i,$w.$q);
  49.             }
  50.         }
  51. 	}   
  52.  
  53. 		$ndata=buildTree($datas);
  54.  
  55. 		printTree($ndata);
  56.  
Success #stdin #stdout #stderr 0.02s 24448KB
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stdin
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Standard input is empty
stdout
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1-book1<br>1-1-book2<br>1-1-1-book3<br>
stderr
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PHP Notice:  Undefined variable: i in /home/ul74df/prog.php on line 47
PHP Notice:  Undefined variable: i in /home/ul74df/prog.php on line 47
https://ideone.com/D3VrZG
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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