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Convert the returned data set into an array tree

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Release： 2016-07-25 09:01:28
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$old = array(
array('id'=>1,'pid'=>0,'name'=>'first' ),
array('id'=>2,'pid'=>1,'name'=>'second' ) ,
array('id'=>3,'pid'=>2,'name'=>'third'),
);
print_r(list_to_tree($old,'id','pid','_child'));
The output is as follows
$old = array(
array(
'id'=>1,
'pid'=>0,
'name'=>'first',
'_child'=>array(
'id'=>2,
' pid'=>1,
'name'=>'second'
'_child'=>array('id'=>3,'pid'=>2,'name'=>'third' ),
),
 ) ,

);
  1. /**
  2. * Convert the returned data set into a Tree
  3. * @access public
  4. * @param array $list The data set to be converted
  5. * @param string $pid parent tag field
  6. * @param string $level level tag field
  7. * @ return array
  8. */
  9. function list_to_tree($list, $pk='id',$pid = 'pid',$child = '_child',$root=0) {
  10. // Create Tree
  11. $tree = array();
  12. if(is_array($list)) {
  13. // Create an array reference based on the primary key
  14. $refer = array();
  15. foreach ($list as $key => $data) {
  16. $refer[$data[$pk]] =& $list[$key];
  17. }
  18. foreach ($list as $key => $data) {
  19. // Determine whether parent exists
  20. $parentId = $ data[$pid];
  21. if ($root == $parentId) {
  22. $tree[] =& $list[$key];
  23. }else{
  24. if (isset($refer[$parentId])) {
  25. $parent =& $refer[$parentId];
  26. $parent[$child][] =& $list[$key];
  27. }
  28. }
  29. }
  30. }
  31. return $tree;
  32. }
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Related labels：
把返回的数据集转换成数组树
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