HTTP Авторизация

<?php
if ($_SERVER['REMOTE_ADDR'] != "88.87.70.59")
header ("location: ".$_SERVER['HTTP_REFERRER']."");
else
{
if (!isset($_SERVER['PHP_AUTH_USER']))
{
Header ("WWW-Authenticate: Basic realm=\"Admin Panel\"");
Header ("HTTP/1.0 401 Unauthorized");
exit();
}
else 
{
if (!get_magic_quotes_gpc())
{
$_SERVER['PHP_AUTH_USER'] = mysql_escape_string($_SERVER['PHP_AUTH_USER']);
$_SERVER['PHP_AUTH_PW'] = mysql_escape_string($_SERVER['PHP_AUTH_PW']);
}
include('db_connect.php');
$result = mysql_query("SELECT `username`, `password` FROM admins WHERE username='$_SERVER[PHP_AUTH_USER]' AND password='$_SERVER[PHP_AUTH_PW]'");
if (!$result)
{
Header ("WWW-Authenticate: Basic realm=\"Admin Panel\"");
Header ("HTTP/1.0 401 Unauthorized");
}
if (mysql_num_rows($result) == 0)
{
Header ("WWW-Authenticate: Basic realm=\"Admin Panel\"");
Header ("HTTP/1.0 401 Unauthorized");
exit();
}
$row = mysql_fetch_array($result);
 
if ($_SERVER['PHP_AUTH_PW'] != $row['password'] || $_SERVER['PHP_AUTH_USER'] != $row['username'])
{
Header ("WWW-Authenticate: Basic realm=\"Admin Panel\"");
Header ("HTTP/1.0 401 Unauthorized");
exit();
}
}
}
?>

<?php
  if (!isset($_SERVER['PHP_AUTH_USER'])) {
    header('WWW-Authenticate: Basic realm="test"');
    header('HTTP/1.0 401 Unauthorized');
    exit;
  } else {
    echo "<p>Логин: ".$_SERVER['PHP_AUTH_USER']."</p>";
    echo "<p>Пароль: ".$_SERVER['PHP_AUTH_PW']."</p>";
  }
?>