<?php 
error_reporting(E_ALL); 
$auth = false; 

$user = array("username1","username2","username3");
$pass = array("password1","password2","username3");

$num = count($user); 

if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) { 
    for($i=0; $i<$num; $i++) { 
        if($_SERVER['PHP_AUTH_USER'] == $user[$i] && $_SERVER['PHP_AUTH_PW'] == $pass[$i]) 
            $auth = true; 
    } 
} 

if(!$auth) { 
    header('WWW-Authenticate: Basic realm="Cassy-web CLUB"');  
    header('HTTP/1.0 401 Unauthorized'); 
     
    echo '<center><h1>Authentication failed</h1>Username and Password required<br><br>Private Section !!!</center>'; 
    exit; 
} 
echo 'Dit is de geheime pagina'; //je kan er ook een frame in zetten 
?>