PHP数组到多维数组

Question

我在php中有一个包含id和parent_id的对象的数组.没有parent_id的所有对象应该是新数组中的根对象.

所有对象都具有PARENT_ID应该正确的对象的孩子数组中推:

所以这是我原来的数组:

array
  0 => 
    object(Node)[528]
      protected 'id' => int 1
      protected 'parent_id' => null
  1 =>
   object(Node)[529]
      protected 'id' => int 2
      protected 'parent_id' => null
  2 => 
   object(Node)[530]
      protected 'id' => int 3
      protected 'parent_id' => 1
  3 =>  
   object(Node)[531]
      protected 'id' => int 4
      protected 'parent_id' => 1
  4 =>  
  object(Node)[532]
      protected 'id' => int 5
      protected 'parent_id' => 4
  5 =>  
  object(Node)[533]
      protected 'id' => int 6
      protected 'parent_id' => 4

这就是新数组应该是这样的:

$nodes = array(
  array(
   'id' => 1,
   'parent_id' => null,
   'children' => array(
    array(
     'id' => 3,
     'parent_id' => 1,
     'children' => null
    ),
    array(
     'id' => 4,
     'parent_id' => 1,
     'children' => array(
      array(
       'id' => 5,
       'parent_id' => 4
      ),
      array(
       'id' => 6,
       'parent_id' => 5
      ), 
     )
    ),
   ),
  ),
  array(
   'id' => 2,
   'parent_id' => null,
   'children' => null
  ),
 );

任何想法我怎么能这样做？

Answer 1

尝试这样的事情:

// collects all nodes that belong to a certain parent id
function findChildren($nodeList, $parentId = null) {
    $nodes = array();

    foreach ($nodeList as $node) {
        if ($node['parent_id'] == $parentId) {
            $node['children'] = findChildren($nodeList, $node['id']);
            $nodes[] = $node;
        }
    }

    return $nodes;
}

像这样使用它:

$nestedNodes = findChildren($nodeList);

此代码递归搜索parent_id原始中的给定$nodeList.如果找到匹配的节点,它将搜索此节点的子节点,依此类推.如果找不到给定的子parent_id节点,则重新调整空数组.

您可以通过使用引用来减少此方法的内存使用量$nodeList.