Autoloading Namespaced Classes - php

Question

I have searched high and low for an answer and tried every example, but this still fails to find my classes. Why do I keep getting Fatal error: Class 'ProjectMorpheus\model\Database' not found in C:\Portables\xampp\htdocs\ProjectMorpheus\config\config.php on line 23
/ProjectMorpheus
/model
Database.class.php
/config
config.php
So my Database class has a namespace like this:
namespace ProjectMorpheus\model;
class Database { ... }
Finally, my config.php has a function autoloader function (Note: __SITE_PATH = 'C:\Portables\xampp\htdocs\ProjectMorpheus\'):
/*** auto load model classes ***/
function __autoload($class){
$parts = explode('\\', $class);
include __SITE_PATH . 'model/' . end($parts) . '.class.php';
}
$dbh = \ProjectMorpheus\model\Database::getInstance($dsn, $username, $password);
Using spl_autoloader appears to work, but why? My only guess is that $class is not the same in both instances. My spl_function looks like:
spl_autoload_register(function($class){
$parts = explode('\\', $class);
include __SITE_PATH . 'model/' . end($parts) . '.class.php';
});

Answer 1

Why don't you use PSR-0 or PSR-4 autoloader standards?
They even have ready-to-use autoloader class on GitHub As long as you will follow the rules, you won't have any issues and your code will be PSR.
Although I wouldn't recommend but if you would like to insist using the code above for autoloading classes (only in models folder) then try to dump what is the value of __SITE_PATH . 'model/' . end($parts) . '.class.php'; and check if you can access it. You can even try to copy and paste the path to your file explorer to see if the location is reachable and file exists in that directory.
P.S. I tried to add this as a comment but I couldn't due to low rep. points (being new around here and all).