public function getUserDetailsWithPassword($username, $password)
    {
    $returnValue = array();
    $sql = "select userUsername,userPassword from userInfo where userUsername='" .$username . "' and userPassword='" .$password . "'";

    $result = $this->conn->query($sql);
    if ($result != null && (mysqli_num_rows($result) >= 1)) {
    $row = $result->fetch_array(MYSQLI_ASSOC);
    if (!empty($row)) {
    $returnValue = $row;
    }
    }
    return $returnValue;
    }

$dao = new MySQLDao();
$dao->openConnection();
$userDetails = $dao->getUserDetailsWithPassword($username, $secure_password);

if(!empty($userDetails))
{
$returnValue["status"] = "Success";
$returnValue["message"] = "User is registered";
echo json_encode($returnValue);
} else {

$returnValue["status"] = "error";
$returnValue["message"] = "User is not found";
echo json_encode($returnValue);
}