<?php
// loginagain.php
// RJM Programming
// May, 2015
// Thanks to Professional PHP Programming by Jesus Castagnetto, Haeish Rawat, Sascha Schumann, Chris Scollo, Deepak Veliath ... chapter 20
require_once("db_connect.php");
if (!isset($_SERVER["PHP_AUTH_USER"])) {
  header("WWW-authenticate: basic realm=\"restricted area\"");
  header("HTTP/1.0 401 Unauthorized");
  echo "You're username/password is incorrect ...";
  exit;
} else {
  $link = db_connect(); //mysql_connect("localhost", "root", "root");
  if (!$link) {
    die('Could not connect: ' . mysql_error());
  }
  mysql_select_db("users");
  $username=strtolower($_SERVER["PHP_AUTH_USER"]);
  $result=mysql_query("SELECT password FROM users WHERE username='" . $username . "'");
  $row=mysql_fetch_array($result);
  if ($_SERVER["PHP_AUTH_PW"] != $row["password"]) {
  header("WWW-authenticate: basic realm=\"restricted area\"");
  header("HTTP/1.0 401 Unauthorized");
  echo "You're username/password is wrong ...";
  exit;
  }
}
?>
Only users okay to here.