PHP数组转树结构以及树结构转数组

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public function index()
    {
   $data = [
  [
 'id'=>1,
 'parent_id' => 0,
 'name' => '第一个'
  ],

  [
 'id'=>2,
 'parent_id' => 0,
 'name' => '第二个'
  ],

  [
 'id'=>3,
 'parent_id' => 1,
 'name' => '第三个'
  ],

   ];
   $r = $this->list_to_tree($data);
   dump($r);
    }

#数组转树结构#

function list_to_tree($list, $root = 0, $pk = 'id', $pid = 'parent_id', $child = 'children'){
    // 创建Tree
    $tree = array();
    if (is_array($list)) {
   // 创建基于主键的数组引用
   $refer = array();
   foreach ($list as $key => $data) {
  $refer[$data[$pk]] = &$list[$key];
   }
   foreach ($list as $key => $data) {
  // 判断是否存在parent
  $parentId = 0;
  if (isset($data[$pid])) {
 $parentId = $data[$pid];
  }
  if ((string)$root == $parentId) {
 $tree[] = &$list[$key];
  } else {
 if (isset($refer[$parentId])) {
$parent = &$refer[$parentId];
$parent[$child][] = &$list[$key];
 }
  }
   }
    }
    return $tree;}

#树结构转数组#

function tree_to_list($tree = [], $children = 'children'){
    if (empty($tree) || !is_array($tree)) {
   return $tree;
    }
    $arrRes = [];
    foreach ($tree as $k => $v) {
   $arrTmp = $v;
   unset($arrTmp[$children]);
   $arrRes[] = $arrTmp;
   if (!empty($v[$children])) {
  $arrTmp = tree_to_list($v[$children]);
  $arrRes = array_merge($arrRes, $arrTmp);
   }
    }
    return $arrRes;}

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