Php Json编码获取重复数据

我创建用于在Smarty中列出数据的函数。它工作正常，但我的问题是我得到了两次数据。请帮助我

我的职能如下：

function appListing($requestvars)
{

        try 
        {
            $rh = $this->db->prepare('SELECT * FROM app');
            //$rh->bindParam(':userOwnerId', $_SESSION['userId'], PDO::PARAM_STR);
            $rh->execute();
            $appData['App'] = $rh->fetchAll();
            $this->smartyTemplate->assign('appData', $appData);
            $this->smartyTemplate->assign('request', $requestvars);
            $this->smartyTemplate->assign('homePath', APP_ROOT_DIR);
            //$this->smartyTemplate->display('project/appList.html');
        } 
        catch (PDOException $e)
        {
            $appData = "Error!: " . $e->getMessage();
        }
    echo json_encode($appData);
}

{
 "App": [
 {
  "0": "app_57ba9fc847dd55_57218508",
  "1": "旅行台南",
  "2": "https://play.google.com/",
  "3": "https://play.google.com/1471848392.png",
  "4": "1471848392",
  "5": "1471848392",
  "appId": "app_57ba9fc847dd55_57218508",
  "appName": "旅行台南",
  "appURL": "https://play.google.com/",
  "appImage": "https://play.google.com/1471848392.png",
  "createTime": "1471848392",
  "lastUpdateTime": "1471848392"
 }

我得到的结果如下：

function appListing($requestvars)
{

        try 
        {
            $rh = $this->db->prepare('SELECT * FROM app');
            //$rh->bindParam(':userOwnerId', $_SESSION['userId'], PDO::PARAM_STR);
            $rh->execute();
            $appData['App'] = $rh->fetchAll();
            $this->smartyTemplate->assign('appData', $appData);
            $this->smartyTemplate->assign('request', $requestvars);
            $this->smartyTemplate->assign('homePath', APP_ROOT_DIR);
            //$this->smartyTemplate->display('project/appList.html');
        } 
        catch (PDOException $e)
        {
            $appData = "Error!: " . $e->getMessage();
        }
    echo json_encode($appData);
}

{
 "App": [
 {
  "0": "app_57ba9fc847dd55_57218508",
  "1": "旅行台南",
  "2": "https://play.google.com/",
  "3": "https://play.google.com/1471848392.png",
  "4": "1471848392",
  "5": "1471848392",
  "appId": "app_57ba9fc847dd55_57218508",
  "appName": "旅行台南",
  "appURL": "https://play.google.com/",
  "appImage": "https://play.google.com/1471848392.png",
  "createTime": "1471848392",
  "lastUpdateTime": "1471848392"
 }

我希望输出为：

{
 "App": [
 {
  "appId": "app_57ba9fc847dd55_57218508",
  "appName": "旅行台南",
  "appURL": "https://play.google.com/",
  "appImage": "https://play.google.com/1471848392.png",
  "createTime": "1471848392",
  "lastUpdateTime": "1471848392"
 }

---

使用

PDO:：FETCH_ASSOC

。

fetchAll（）

的默认值是

PDO:：FETCH_BOTH

，它返回一个包含数字索引和命名索引的数组

        $appData['App'] = $rh->fetchAll(PDO::FETCH_ASSOC);

---

使用

PDO:：FETCH_ASSOC

。

fetchAll（）

的默认值是

PDO:：FETCH_BOTH

，它返回一个包含数字索引和命名索引的数组

        $appData['App'] = $rh->fetchAll(PDO::FETCH_ASSOC);