有一个这样的数组，如何遍历出每级别下面的username数量，级别有n级

Question

Array(
    [cn103025] => Array
        (
            [username] => cn103025
            [tjrname] => cn329150
            [child] => Array
                (
                    [cn220789] => Array
                        (
                            [username] => cn220789
                            [tjrname] => cn103025
                        )                )        )    [cn189165] => Array
        (
            [username] => cn189165
            [tjrname] => cn329150
        )    [cn959602] => Array
        (
            [username] => cn959602
            [tjrname] => cn329150
            [child] => Array
                (
                    [cn686206] => Array
                        (
                            [username] => cn686206
                            [tjrname] => cn959602
                        )                )        ))

Answer 1

你所说的每个级别是指数组的1,2,3维数组里的各有多少username，还是每个一维数组的cnxxxxxx包含的username数量

Answer 2

每维数组的cnxxxxxx包含的username数量

Answer 3

不知道你打算怎样展示结果，所以我就直接放进数组中了$a = array (
  'cn103025' => 
  array (
    'username' => 'cn103025',
    'tjrname' => 'cn329150',
    'child' => 
    array (
      'cn220789' => 
      array (
        'username' => 'cn220789',
        'tjrname' => 'cn103025',
      ),
    ),
  ),
  'cn189165' => 
  array (
    'username' => 'cn189165',
    'tjrname' => 'cn329150',
  ),
  'cn959602' => 
  array (
    'username' => 'cn959602',
    'tjrname' => 'cn329150',
    'child' => 
    array (
      'cn686206' => 
      array (
        'username' => 'cn686206',
        'tjrname' => 'cn959602',
      ),
    ),
  ),
);
Statistics($a);
print_r($a);function Statistics(&$ar) {
  $cnt = 0;
  foreach($ar as $k=>&$v) {
    if(isset($v['username'])) $cnt++;
    if(isset($v['child'])) {
      $cnt += Statistics($v['child']);
    }
  }
  $ar['cnt'] = $cnt;
  return $cnt;
}Array
(
    [cn103025] => Array
        (
            [username] => cn103025
            [tjrname] => cn329150
            [child] => Array
                (
                    [cn220789] => Array
                        (
                            [username] => cn220789
                            [tjrname] => cn103025
                        )                    [cnt] => 1
                )        )    [cn189165] => Array
        (
            [username] => cn189165
            [tjrname] => cn329150
        )    [cn959602] => Array
        (
            [username] => cn959602
            [tjrname] => cn329150
            [child] => Array
                (
                    [cn686206] => Array
                        (
                            [username] => cn686206
                            [tjrname] => cn959602
                        )                    [cnt] => 1
                )        )    [cnt] => 5
)