致命错误：无法使用字符串作为数组

Question

Array 
(
    [0] => Array 
     (
      [auth_id] => 1 
      [auth_section] => Client Data Base 
      [auth_parent_id] => 0 
      [auth_admin] => 1 
      [sub] => Array 
       (
        [0] => Array 
         (
          [auth_id] => 2 
          [auth_section] => Client Contact 
          [auth_parent_id] => 1 
          [auth_admin] => 1 
         ) 

       ) 

     ) 

    [1] => Array 
     (
      [auth_id] => 6 
      [auth_section] => All Back Grounds 
      [auth_parent_id] => 0 
      [auth_admin] => ,4 
      [sub] => Array 
       (
        [0] => Array 
         (
          [auth_id] => 7 
          [auth_section] => Edit Custom 
          [auth_parent_id] => 6 
          [auth_admin] => 1 
         ) 
       ) 

     ) 

    [2] => Array 
     (
      [auth_id] => 20 
      [auth_section] => Order Mail 
      [auth_parent_id] => 0 
      [auth_admin] => 1 
      [sub] => 
     ) 

} 

抵消当我处理子内阵列

for($in=0 ; $in < count($auth); $in++){ 

    $autsub  = $auth[$in]["sub"]; 

    for($g=0 ; $g<count($autsub); $g++){ 

     echo $autsub[$g]["auth_id"]; 

    } 
} 

它示出了该误差

Fatal error: Cannot use string offset as an array.........

我怎样才能避免:(

Answer 1

问题是数组中的最后一项（2）没有sub数组，但仍尝试访问它。您需要检查该条目是否存在以及在循环之前是否为数组。这里使用一个示例foreach：

foreach ($array as $auth) { 
    if (!empty($auth['sub']) && is_array($auth['sub'])) { 
     foreach ($auth['sub'] as $sub) { 
      if (!empty($sub['auth_id'])) { 
       echo $sub['auth_id']; 
      } 
     } 
    } 
} 

Answer 2

您可以使用is_array（）函数测试偏移类型。如果您想要更好的答案，请发送处理代码。 测试$ auth [$ in]和$ autsub [$ g]是否为数组。