Manipulate JSON

Question

我正在開發一個codeigniter應用程序。我需要以這種格式返回的json數據。

{ 
     options: [ 
    {id:"1",text:"test"}, 
    {id:"2",text:"kabita123"}, 
    {id:"3",text:"purnima"}, 
    {id:"4",text:"raju123"}, 
    {id:"5",text:"saad123"}, 
    {id:"12",text:"apf123"} 
     ] 
    } 

然而，返回數據的時候，我只有它採用該格式

[{"id":"1","text":"test"}, 
{"id":"2","text":"kabita123"}, 
{"id":"3","text":"purnima"}, 
{"id":"4","text":"raju123"}, 
{"id":"5","text":"saad123"}, 
{"id":"12","text":"apf123"}] 

我在哪裏做錯了？我使用生成JSON數據的代碼

 $users = $this->user_m->get_all(); 
     $user_arr = []; 
     $i=0; 
     foreach ($users as $user) { 
      $user_arr[$i] = new stdClass(); 
      $user_arr[$i]->id = $user->id; 
      $user_arr[$i]->text = $user->username; 
      $i++; 
     } 
     //add the header here 
     header('Content-Type: application/json'); 
     echo json_encode($user_arr); 

Answer 1

變化：

echo json_encode($user_arr); 

到：

echo json_encode(array('options' => $user_arr));