PHP/Utility Function/base64 decode

Using base64_decode(), the User Data Is Readable

   <source lang="html4strict">

<?php if (isset($_SERVER["HTTP_AUTHORIZATION"]) && substr($_SERVER["HTTP_AUTHORIZATION"], 0, 6) == "Basic") {

 echo("HTTP_AUTHORIZATION: Basic " . htmlspecialchars(base64_decode(substr($_SERVER["HTTP_AUTHORIZATION"], 6))));

} else {

 header("WWW-Authenticate: Basic realm=\"PHP\"");
 header("HTTP/1.0 401 Unauthorized");

} ?>

 </source>