Object Moved error html to php - php

Question

I honestly don't know what's wrong. Every time I try to add an account to my xml database file, it doesn't get written in the file. I don't see anything wrong with my code.
When I click my submit button this page's content is displayed
Object Moved
This document may be found here
//This is me testing my code below
hey im in the if statement
hogwartsBoss
swag
hogwartsBoss#gmail.com
Harry
Potter
BabyMetal Head Bangya!!
Iron Madien Run to the Hills
japybunnyhijapygen#yahoo.com genesis Bejarano
HTML SIGN UP FILE
<!--This is the sign up section on the Home Website page -->
<form method="post" action="sign_up.php">
First Name:<input type= "text" name="first"/><br /><br />
Last Name:<input type= "text" name="last"/><br /><br />
Email:<input type= "text" name="email"/><br /><br />
Username:<input type= "text" name="username"/><br /><br />
Password:<input type= "password" name="password"/><br /><br />
<input type= "submit" name="submit" value="Sign up"/>
</form>
PHP SIGN UP FILE
$f = $l = $e= $user = $pass = null;
if(isset($_POST['username']) && !empty($_POST['username'])) {
echo "hey im in the if statement";
include 'xmlconnect.php';
$f=vaildName($_POST['first']);
$l=vaildName($_POST['last']);
$e=vaildEmail($_POST['email']);
$user= $_POST['username'];
$pass= $_POST['password'];
$credTag = $xml->addChild('credentials');
//user account info
$userTag = $credTag->addChild('username',$user);
$passTag = $credTag->addChild('password',$pass);
$emailTag = $credTag->addChild('email',$e);
$infoTag = $credTag->addChild('info');
$firstTag = $infoTag->addChild('first',$f);
$lastTag = $infoTag->addChild('last',$l);
file_put_contents('UserAccountDB.xml',$xml->asXML());
echo $xml->asXML();
// echo "updated database";
// printf($xml);
//redirects you to the homepage
session_start();
$_SESSION['userName'] = $user;
//$url = "http://cs3360.cs.utep.edu/gbejarano/WebStore/UserAccountDB.xml";
//$url = "http://cs3360.cs.utep.edu/gbejarano/WebStore/myLibrary.php";
//$url = 'http://localhost/Music_Webstore/myLibrary.php';
header('Location: '.$url);
}

Answer 1

There is a great misunderstanding here:
Object Moved
This document may be found here
is not an error message. It's your web-server's standard response body of a message in the Redirect 3xx group. Those do not denote errors, just standard redirects.
Those redirects are expected because you answer with a redirect:
header('Location: '.$url);
However using
echo $xml->asXML();
before the header command does not work at all. Please consult the PHP manual on how to do a proper redirect and related to other existing Q&A material here on site as well before you draw wild assumptions in a new question and label non-errors as errors and cause other confusion.
If certain words are not clear to you, ask about the words first.
If you have problem to decipher a message the computer gives to you, ask about the message first.
Do not post live code. Instead create a new example from scratch that contains as little code and data as necessary to reproduce your issue.

Answer 2

Sometimes the solution is simple:
It wasn't my code it was my school server security