php 设置浏览网页时验证

 
if (($_SERVER['PHP_AUTH_USER'] != 'specialuser') || ($_SERVER['PHP_AUTH_PW'] != 'secretpassword')) {
   header('WWW-Authenticate: Basic Realm="Secret Stash"');
   header('HTTP/1.0 401 Unauthorized');
   print('You must provide the proper credentials!');
   exit;
}else{
    echo 'ok';
}