php 设置浏览网页时验证

php代码

   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';
   }