Untitled

<?php

if(!(isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW']))){
   header('WWW-Authenticate: Basic realm="Restricted Area');
   header('HTTP/1.0 401 Unauthorized');
   die('Acesso Não Autorizado!');
}

$validPasswords = ["neto" => "1234"];//consulta ao banco para login e guardar em array ['login' = > 'Senha'];
$validUser = array_keys($validPasswords);
//recebe usuário e senha do cliente
$user = $_SERVER['PHP_AUTH_USER'];
$pass = $_SERVER['PHP_AUTH_PW'];

$validate = (in_array($user, $validUser) && $pass = $validPasswords[$user]);

if (!$validate){
   header('WWW-Authenticate: Basic realm="Restricted Area');
   header('HTTP/1.0 401 Unauthorized');
   die('Acesso Não Autorizado!');
}

echo "ENTROU";
?>

<!DOCTYPE html>
<html>
    <head>
        <title>Autenticação HTTP</title>
        <meta charset="ISO-8859-1">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.3.1.min.js"></script>
    </head>
    <body>
        <form name="cookieform" id="login" method="get">
            <input type="text" name="username" id="username" />
            <input type="password" name="password" id="password" />
            <input type="submit" name="sub" value="Submit" onclick="auth()" />
        </form>

   <script>
   var username = $("#username").val();
   var password = $("#password").val();

   function auth(){
      $.ajax({
         type: "GET",
         url: "login.php",
         dataType: 'json',
         async: false,
         data: '{"username": "' + username + '", "password" : "' + password + '"}',
         beforeSend: function (xhr) {
            xhr.setRequestHeader ("Authorization", "Basic " + btoa(function (user, password) {
                  var tok = user + ':' + password;
                  var hash = Base64.encode(tok);
                  return "Basic " + hash;
            }));
         },
         success: function (response){
            alert(response);
         },
         error: function (response){
            alert(response);
         }
      });
   }
   </script>
    </body>
</html>

function auth(){
      // using XMLHttpRequest
      var username = $("input#username").val();
      var password = $("input#password").val();
      var xhr = new XMLHttpRequest();
      xhr.open("GET", "login.php", true);
      xhr.withCredentials = true;
      xhr.setRequestHeader("Authorization", btoa(function (username, password) {
                  var tok = user + ':' + password;
                  var hash = Base64.encode(tok);
                  return 'Basic ' + hash;
            }));
      xhr.onload = function () {
         console.log(xhr.responseText);
      };
      xhr.send();
}