循环数组问题

Question

我有一个 分类树如下：
Array(
    [0] => Array
        (
            [id] => 1
            [name] => 菜单栏目1
            [parentid] => 0
            [child] => Array
                (
                    [0] => Array
                        (
                            [id] => 2
                            [name] => 菜单栏目1-1
                            [parentid] => 1
                            [child] => Array
                                (
                                    [0] => Array
                                        (
                                            [id] => 7
                                            [name] => 菜单栏目1-1-1
                                            [parentid] => 2
                                        )                                    [1] => Array
                                        (
                                            [id] => 8
                                            [name] => 菜单栏目1-1-2
                                            [parentid] => 2
                                        )                                    [2] => Array
                                        (
                                            [id] => 9
                                            [name] => 菜单栏目1-1-3
                                            [parentid] => 2
                                        )                                )                        )                    [1] => Array
                        (
                            [id] => 3
                            [name] => 菜单栏目1-2
                            [parentid] => 1
                        )                    [2] => Array
                        (
                            [id] => 4
                            [name] => 菜单栏目1-3
                            [parentid] => 1
                        )                    [3] => Array
                        (
                            [id] => 5
                            [name] => 菜单栏目1-4
                            [parentid] => 1
                        )                    [4] => Array
                        (
                            [id] => 6
                            [name] => 菜单栏目1-5
                            [parentid] => 1
                        )                )        )    [1] => Array
        (
            [id] => 10
            [name] => 菜单栏目2
            [parentid] => 0
            [child] => Array
                (
                    [0] => Array
                        (
                            [id] => 11
                            [name] => 菜单栏目2-1
                            [parentid] => 10
                        )                )        ))想分解成 
菜单栏目1
    菜单栏目1-1
        菜单栏目1-1-1
    参贷栏目1-2
菜单栏目2
    菜单栏目2-1
    菜单栏目2-2
这样的结果 请问 如何 循环分解 这个树 是N维 数组

Answer 1

<xmp>
<?php
$a = array (
  0 => 
  array (
    'id' => '1',
    'name' => '菜单栏目1',
    'parentid' => '0',
    'child' => 
    array (
      0 => 
      array (
        'id' => '2',
        'name' => '菜单栏目1-1',
        'parentid' => '1',
        'child' => 
        array (
          0 => 
          array (
            'id' => '7',
            'name' => '菜单栏目1-1-1',
            'parentid' => '2',
          ),
          1 => 
          array (
            'id' => '8',
            'name' => '菜单栏目1-1-2',
            'parentid' => '2',
          ),
          2 => 
          array (
            'id' => '9',
            'name' => '菜单栏目1-1-3',
            'parentid' => '2',
          ),
        ),
      ),
      1 => 
      array (
        'id' => '3',
        'name' => '菜单栏目1-2',
        'parentid' => '1',
      ),
      2 => 
      array (
        'id' => '4',
        'name' => '菜单栏目1-3',
        'parentid' => '1',
      ),
      3 => 
      array (
        'id' => '5',
        'name' => '菜单栏目1-4',
        'parentid' => '1',
      ),
      4 => 
      array (
        'id' => '6',
        'name' => '菜单栏目1-5',
        'parentid' => '1',
      ),
    ),
  ),
  1 => 
  array (
    'id' => '10',
    'name' => '菜单栏目2',
    'parentid' => '0',
    'child' => 
    array (
      0 => 
      array (
        'id' => '11',
        'name' => '菜单栏目2-1',
        'parentid' => '10',
      ),
    ),
  ),
);function show($ar, $deep=0) {
  foreach($ar as $item) {
    echo str_repeat('　', $deep) . $item['name'] . PHP_EOL;
    if(! empty($item['child'])) show($item['child'], $deep+1);
  }
}show($a);菜单栏目1
　菜单栏目1-1
　　菜单栏目1-1-1
　　菜单栏目1-1-2
　　菜单栏目1-1-3
　菜单栏目1-2
　菜单栏目1-3
　菜单栏目1-4
　菜单栏目1-5
菜单栏目2
　菜单栏目2-1