php mysqli_stmt::未定义get_result[重复]

这是我的代码:

include 'conn.php';
$conn = new Connection();
$query = 'SELECT EmailVerified, Blocked FROM users WHERE Email = ? AND SLA = ? AND `Password` = ?';
$stmt = $conn->mysqli->prepare($query);
$stmt->bind_param('sss', $_POST['EmailID'], $_POST['SLA'], $_POST['Password']);
$stmt->execute();
$result = $stmt->get_result();

最后一行的错误是: 调用未定义的方法mysqli_stmt::get_result()

下面是conn.php的代码:

define('SERVER', 'localhost');
define('USER', 'root');
define('PASS', 'xxxx');
define('DB', 'xxxx');
class Connection{
    /**
     * @var Resource 
     */
    var $mysqli = null;

    function __construct(){
        try{
            if(!$this->mysqli){
                $this->mysqli = new MySQLi(SERVER, USER, PASS, DB);
                if(!$this->mysqli)
                    throw new Exception('Could not create connection using MySQLi', 'NO_CONNECTION');
            }
        }
        catch(Exception $ex){
            echo "ERROR: ".$e->getMessage();
        }
    }
}

如果我写这行:

if(!stmt) echo 'Statement prepared'; else echo 'Statement NOT prepared';

它印出来了 '未准备报表' . 如果我直接在ide中运行查询替换?有价值的标记,效果很好。请注意,$conn object在项目中的其他查询中工作正常。

请帮忙……