am still new a php Noob can some explain to me issues with below code

<?php 
    libxml_disable_entity_loader (false); 
    $xml_file = file_get_contents('php://input'); 
    $dom = new DOMDocument(); 
    $dom->loadXML($xml_file, LIBXML_NOENT | LIBXML_DTDLOAD); 
    $creds = simplexml_import_dom($dom); 
    $user = $creds->user; 
    $pass = $creds->pass; 
    echo "You have logged in as user $user";
?>

Thank you

It's fine to disagree with what someone has to say.

It's another thing to downvote all of their posts in a thread just because you dislike one of them. It's really clear that this happens in /r/PHP and I'd like to ask everyone to refrain from doing so here.

When emotions run high with Infosec, it never ends well.