我使用了函数，它运行良好，但对于$ userRow = $ stmt-＆gt; fetch（PDO :: FETCH_ASSOC）;没有工作

Question

美好的一天，请帮我解决（$userRow=$stmt->fetch(PDO::FETCH_ASSOC);）

的问题

public function doLogin($uname,$umail,$upass)
{
    try
    {
        $stmt = $this->conn->prepare("SELECT acctID, username, email, password FROM tbl_user WHERE username=:uname OR email=:umail ");
        $stmt->execute(array(':uname'=>$uname, ':umail'=>$umail));
        $userRow=$stmt->fetch(PDO::FETCH_ASSOC);
        if($stmt->rowCount() == 0)
        {
            if(password_verify($upass, $userRow['password']))
            {
                $_SESSION['user_session'] = $userRow['acctID'];
                return true;
            }
            else
            {
                return false;
            }
        }
    }
    catch(PDOException $e)
    {
        echo $e->getMessage();
    }
}