php encoded to json parse error

<?php
require_once '../../dbconfig.php';
require_once '../mail/send_mail.php';

$result=[];

if(empty($_POST['verify_id']) && empty($_POST['code']))
{
 $result['success']=false;
 $result['error_msg']="codici non ricevuti";
 //$user->redirect('index.php');
}

if(isset($_POST['verify_id']) && isset($_POST['code']))
{
 $id = base64_decode($_POST['verify_id']);
 $code = $_POST['code'];

 $statusY = "Y";
 $statusN = "N";

 $stmt = $db_con->prepare("SELECT user_id,userStatus FROM tbl_users WHERE user_id=:uID AND tokenCode=:code LIMIT 1");
 $stmt->execute(array(":uID"=>$id,":code"=>$code));
 $row=$stmt->fetch(PDO::FETCH_ASSOC);
 if($stmt->rowCount() > 0)
 {
  $result["success"]=true;
  if($row['userStatus']==$statusN)
  {
   $stmt = $db_con->prepare("UPDATE tbl_users SET userStatus=:status WHERE user_id=:uID");
   $stmt->bindparam(":status",$statusY);
   $stmt->bindparam(":uID",$id);
   $stmt->execute();
   $msg = "
             <div class='alert alert-success'>
       <button class='close' data-dismiss='alert'>&times;</button>
       <strong>WoW !</strong>  Il vostro account è attivo : <a href='../../index.html'>Login here</a>
          </div>
          ";
    $result['success_msg']=$msg;
  }
  else
  {
     $result['success']=false;
   $msg = "
             <div class='alert alert-error'>
       <button class='close' data-dismiss='alert'>&times;</button>
       <strong>sorry !</strong>  Il vostro account è già attivo : <a href='../../index.html'>Login here</a>
          </div>
          ";
    $result['error_msg']=$msg;
  }
 }
 else
 {
     $result['success']=false;
  $msg = "
         <div class='alert alert-error'>
      <button class='close' data-dismiss='alert'>&times;</button>
      <strong>sorry !</strong>  Account non trovato : <a href='../../subscribe.html'>Signup here</a>
      </div>
      ";
      $result['id']=$id;
    $result['error_msg']=$msg;
 }
}
echo json_encode($result);
?>