Question

我有一个像这样的数组

我想从这个阵列中得到什么

One
Two
Three
Three >> Three and one
Three >> Three and two
Three >> Three and two >> Three and two and one
Three >> Three and three
Four
Four >> Four and one

我尝试了什么

$category = myarray;
renderNode($category);

function renderNode($node) {
        foreach($node as $cat){
            echo $cat['category_name'].'<br >';
            if(!empty($cat[children_recursive'])){
                renderNode($cat[children_recursive']);
            }
        }
    }

我的输出是

One
Two
Three
Three and one
Three and two
Three and two and one
Three and three
Four
Four and one

修改这是使用var_export的完整数组列表，因此您可以直接使用并粘贴

array (
  0 => 
  array (
    'id' => 1,
    'category_name' => 'One',
    'parent_id' => NULL,
    'children_recursive' => 
    array (
    ),
  ),
  1 => 
  array (
    'id' => 2,
    'category_name' => 'Two',
    'parent_id' => NULL,
    'children_recursive' => 
    array (
    ),
  ),
  2 => 
  array (
    'id' => 3,
    'category_name' => 'Three',
    'parent_id' => NULL,
    'children_recursive' => 
    array (
      0 => 
      array (
        'id' => 17,
        'category_name' => 'Three and one',
        'parent_id' => 3,
        'children_recursive' => 
        array (
        ),
      ),
      1 => 
      array (
        'id' => 19,
        'category_name' => 'Three and two',
        'parent_id' => 3,
        'children_recursive' => 
        array (
          0 => 
          array (
            'id' => 21,
            'category_name' => 'Three and two and one',
            'parent_id' => 19,
            'children_recursive' => 
            array (
            ),
          ),
        ),
      ),
      2 => 
      array (
        'id' => 20,
        'category_name' => 'Three and three',
        'parent_id' => 3,
        'children_recursive' => 
        array (
        ),
      ),
    ),
  ),
  3 => 
  array (
    'id' => 4,
    'category_name' => 'Four',
    'parent_id' => NULL,
    'children_recursive' => 
    array (
      0 => 
      array (
        'id' => 18,
        'category_name' => 'Four and one',
        'parent_id' => 4,
        'children_recursive' => 
        array (
        ),
      ),
    ),
  ),
)

Answer 1

类似的东西：

java.lang.IllegalStateException: Haven't seen any document yet.

Answer 2

您可以使用RecursiveArrayIterator。你需要像这样扩展它：

class RecursiveChildrenIterator extends RecursiveArrayIterator
{
    public function hasChildren()
    {
        return !empty($this->current()['children_recursive']);
    }

    public function getChildren()
    {
        return new static($this->current()['children_recursive']);
    }
}

有了这个课程，您只需循环使用一个foreach：

$iterator = new RecursiveIteratorIterator(
    new RecursiveChildrenIterator($array),
    RecursiveIteratorIterator::SELF_FIRST  
);

$result = [];
$current = [];
foreach ($iterator as $item) {
    $current[$iterator->getDepth()] = $item['category_name'];

    if (!$iterator->hasChildren()) {
        $result[] = implode(
            '>>',
            array_slice($current, 0, $iterator->getDepth() + 1)
        );
    }
}

通知传递给RecursiveIteratorIterator的RecursiveIteratorIterator::SELF_FIRST标记。

这是working demo。

<强>增加：

我实际上误读了你想要的数组，所以为了得到你想要的那个删除条件：

foreach ($iterator as $item) {
    $current[$iterator->getDepth()] = $item['category_name'];

    $result[] = implode(
        '>>',
        array_slice($current, 0, $iterator->getDepth() + 1)
    );
}

这是working demo。

您可以阅读有关iterators的更多信息。

Answer 3

$category = myarray;
renderNode($category);

function renderNode($parent_category_name = '' ,$node) {
        foreach($node as $cat){
            echo $parent_category_name.$cat['category_name'].'<br >';
            if(!empty($cat[children_recursive'])){
                renderNode($parent_category_name .$cat['category_name'] ." >> ", $cat[children_recursive']);
            }
        }
    }

使用数组中的递归函数获取一行中的所有数据

3 个答案: