How to Copy a file to another directory after submit - php

Question

I am trying to create a directory after a form submit, then after the form is submitted I want that directory to have a file stuffed inside of it. I have tried the php copy function and used an if statement to see if it was copying successfully but it is not. Please take a look at my code and see what is going on. And when it was working, it would just give a "1" output once submitted. No actual file was moved inside of the folder.
if($_POST['submit']=='Register')
{
// If the Register form has been submitted
$root = "/serves/registered.php";
$err = array();
$folder = mkdir($_POST['username']);
$reg = "registered.php";
mkdir($_POST['username']);
copy($root,$folder);
if (!copy($root, $folder)) {
echo "failed to copy $root...\n";
} else {
echo "Account was successfuly created.";
}
Thank you

Answer 1

This can do it:
$root = "serves/registered.php";
$folder = mkdir($_POST['username']);
if($folder) {
$reg = "registered.php";
if (!copy($root, $_POST['username']."/".$reg)) {
echo "failed to copy $root...\n";
} else {
echo "Account was successfuly created.";
}
}
else {
echo "Could not create folder";
}

Answer 2

if($_POST['submit']=='Register')
{
// If the Register form has been submitted
$root = "contact.php";
$folder = $_POST['username'] . '/' . $root;
mkdir($_POST['username']);
if (!copy($root, $folder)) {
echo "failed to copy $root...\n";
} else {
echo "Account was successfuly created.";
}
}