PHP嵌套的類別和子類別JSON

Question

我想用類別和子類別爲我的應用程序嵌套JSON，這是我的代碼

// get all items from myorder table 
$result = mysql_query("SELECT co.country, cl.city_code, cl.city_name 
         FROM country as co, city_list as cl 
         WHERE co.id_country = cl.id_country") or die(mysql_error()); 

$response["location"] = array(); 

while ($row = mysql_fetch_assoc($result)) { 
    $categories['Cities'][] = array(
      'code'   => $row['city_code'], 
      'city'   => $row['city_name'], 
    ); 
} 

foreach ($categories as $key => $value) { 
    $category_data[] = array(
     'category'  => $key, 
     'category_list' => $value, 
    ); 
} 

array_push($response["location"], $categories); 
// echoing JSON response 
echo json_encode($response); 

，這是結果：

{ 
location: [ 
    { 
     USA: { 
      Country: "USA" 
      Cities: [ 
       { 
        code: "AL", 
        city: "ALABAMA" 
       }, 
       { 
        code: "AR", 
        city: "Arkansas" 
       }, 
       { 
        code: "DC", 
        city: "Distric of Columbia" 
       }, 
       { 
        code: "LA", 
        city: "Louisiana" 
       } 
       ] 
      } 
     } 

    ] 
} 

我想要得到這種格式：

{ 
location: [ 
    Country: "USA" 
    Cities: [ 
     { 
      code: "AL", 
      city: "ALABAMA" 
     }, 
     { 
      code: "AR", 
      city: "Arkansas" 
     }, 
     { 
      code: "DC", 
      city: "Distric of Columbia" 
     }, 
     { 
      code: "LA", 
      city: "Louisiana" 
     }, 


    ] 
} 

我該怎麼做到這一點？有沒有我可以研究的參考資料？ 有幫助嗎？

Answer 1

首先，在您的請求中按國名排序。

while ($row = mysql_fetch_assoc($result)) { 
    if (! isset($categories[$row['country']])) { 
      $categories[$row['country']] = array('Country' => $row['country']); 
      $categories[$row['country']]['Cities'] = array(); 
    } 

    $categories[$row['country']]['Cities'][] = array(
     'code'   => $row['city_code'], 
     'city'   => $row['city_name'], 
    ); 

} 

... rest of your code 

順便說一下，你應該停止使用mysql_ *函數並使用mysqli_ *。正如寫在SO上的每一篇文章..