O meu arquivo Config.php no MVC

[Frank K Hosaka]

arquivo /Astudy/Index.php
<?php
require_once __DIR__.'/Modelos/Config.php';
echo DBNAME;
echo NovaClasse::teste();
echo "<br>".$config->dec(2);

arquivo /Astudy/Modelos/Config.php
<?php

class Config {

  public function __Construct(){
    
    defined('HOST') || define('HOST','localhost');
    defined('DBNAME') || define('DBNAME','laravel');
    defined('USER') || define('USER','root');
    defined('PASSWORD') || define('PASSWORD','');

    spl_autoload_register(function($Class){
      $includeDir = false;
      $findDir = ['Modelos'];
      foreach ($findDir as $DirName) {
          if (!$includeDir
            && file_exists($this->FindClass($DirName, $Class))
            && !is_dir($this->FindClass($DirName, $Class))) {
            include_once ($this->FindClass($DirName, $Class));
            $includeDir = true;}}
      if (!$includeDir) {
        die("$Class - Erro interno no servidor ao encontrar dados 
            cruciais de funcionamento!");}});
  }

  public function FindClass($dir,$class) {
      return (
          $_SERVER['DOCUMENT_ROOT']
          . DIRECTORY_SEPARATOR . 'Astudy'
          . DIRECTORY_SEPARATOR . $dir
          . DIRECTORY_SEPARATOR . $class . '.php');}

  public function dec($value){
    if($value!==null){return number_format($value,2,',','.');}}
    
}

// gambiarra
$config = new Config();

arquivo /Astudy/Modelos/NovaClasse.php
<?php

class NovaClasse {
    public static function teste(){return "<br>isso é um teste!";}
}