PHP递归遍历多维数组实现无限分类的方法

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Array
(
 [0] => Array
  (
   [id] => 1
   [parentid] => 0
   [name] => 中国
   [childs] => Array
    (
     [0] => Array
      (
       [id] => 4
       [parentid] => 1
       [name] => 北京
      )
     [1] => Array
      (
       [id] => 5
       [parentid] => 1
       [name] => 上海
      )
     [2] => Array
      (
       [id] => 6
       [parentid] => 1
       [name] => 广西
       [childs] => Array
        (
         [0] => Array
          (
           [id] => 7
           [parentid] => 6
           [name] => 桂林
          )
         [1] => Array
          (
           [id] => 8
           [parentid] => 6
           [name] => 南宁
          )
         [2] => Array
          (
           [id] => 9
           [parentid] => 6
           [name] => 柳州
          )
        )
      )
    )
  )
 [1] => Array
  (
   [id] => 2
   [parentid] => 0
   [name] => 美国
   [childs] => Array
    (
     [0] => Array
      (
       [id] => 10
       [parentid] => 2
       [name] => 纽约
      )
     [1] => Array
      (
       [id] => 11
       [parentid] => 2
       [name] => 华盛顿
      )
    )
  )
 [2] => Array
  (
   [id] => 3
   [parentid] => 0
   [name] => 韩国
   [childs] => Array
    (
     [0] => Array
      (
       [id] => 12
       [parentid] => 3
       [name] => 首尔
      )
    )
  )
)




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