PHP - Error al actualizar el código Php mysqli

<?php

    $host_name  = "db476998781.db.1and1.com";

    $database   = "db476998781";

    $user_name  = "dbo476998781";

    $password   = "<contraseña. >";

    $connect = mysqli_connect($host_name, $user_name, $password, $database);

    if (mysqli_connect_errno())

    {

        echo "Error al conectar con servidor MySQL: " . mysqli_connect_error();

    }

?>

$db476998781 = mysqli_connect($host_name, $user_name, $password, $database) or die ("Error " . mysqli_error($link));

$db476998781 = mysqli_connect($host_name, $user_name, $password, $database) or die ("Error " . mysqli_error($db476998781));

ini_set('display_errors',1);

ini_set('display_startup_errors',1);

error_reporting(-1);

<?php require_once('../Connections/db476998781.php'); ?>

<?php

if (!function_exists("GetSQLValueString")) {

function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")

{

  if (PHP_VERSION < 6) {

    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;

  }

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {

    case "text":

      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";

      break;

    case "long":

    case "int":

      $theValue = ($theValue != "") ? intval($theValue) : "NULL";

      break;

    case "double":

      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";

      break;

    case "date":

      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";

      break;

    case "defined":

      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;

      break;

  }

  return $theValue;

}

}

?>

<?php

// *** Validate request to login to this site.

if (!isset($_SESSION)) {

  session_start();

}

$loginFormAction = $_SERVER['PHP_SELF'];

if (isset($_GET['accesscheck'])) {

  $_SESSION['PrevUrl'] = $_GET['accesscheck'];

}

if (isset($_POST['usuario'])) {

  $loginUsername=$_POST['usuario'];

  $password=$_POST['password'];

  $MM_fldUserAuthorization = "";

  $MM_redirectLoginSuccess = "../index.php";

  $MM_redirectLoginFailed = "login-error.php";

  $MM_redirecttoReferrer = false;

  mysql_select_db($database_db476998781, $db476998781);

  $LoginRS__query=sprintf("SELECT usuario, password FROM `Zona Privada` WHERE usuario=%s AND password=%s",

    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text"));

  $LoginRS = mysql_query($LoginRS__query, $db476998781) or die(mysql_error());

  $loginFoundUser = mysql_num_rows($LoginRS);

  if ($loginFoundUser) {

     $loginStrGroup = "";

	if (PHP_VERSION >= 5.1) {session_regenerate_id(true);} else {session_regenerate_id();}

    //declare two session variables and assign them

    $_SESSION['MM_Username'] = $loginUsername;

    $_SESSION['MM_UserGroup'] = $loginStrGroup;

    if (isset($_SESSION['PrevUrl']) && false) {

      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];

    }

    header("Location: " . $MM_redirectLoginSuccess );

  }

  else {

    header("Location: ". $MM_redirectLoginFailed );

  }

}

?>