Issue with loading user class - php

Question

I have a small problem with the following php code. On the input for the name, I'm trying to show their current username, by $user->username, only it gives me the following error:
Notice: Undefined variable: user in /home//domains//public_html/dev/edit_account.php on line 36
Notice: Trying to get property of non-object in /home//domains//public_html/dev/edit_account.php on line 36
in the game_header.php file I have
$user = new User($_SESSION['id']);
And thought it would work, but sadly it does not.
I have also tried
$user = new User($_SESSION['id']);
on the edit_account.php page, but I was getting the same error.
Here's the edit_account.php code.
Does anyone know what I might be doing wrong here?
include "game_header.php";
$_GET['type'] = isset($_GET['type']) && ctype_alpha($_GET['type']) ? trim($_GET['type']) : '0';
switch($_GET['type']) {
case 'profileoptions' : profile_options(); break;
default : profile_options();
}
function profile_options() {
echo '
';
include 'game_footer.php';
}

Answer 1

When encased into a function you must do the following:
global $user ; //Bring a global variable to the current scope.
echo $user->username ; //Then you can access it and its properties.
So it must start with:
function profile_options() {
global $user ;
//The rest of code
}
However, I recommend you to create a parameter:
function profile_options(User $user){
//Much code
}
Then call it where $user is accessible:
profile_options($user) ;