php-spl

Simple spl_auto_load_register

   spl_autoload_register(function($class) {

      $cs = explode("\\",$class);
      $cr = [];
      for($i=0; $i<count($cs)-1;$i++) {
      $cr[] = lcfirst($cs[$i]);
       }
      $cr[] = $cs[count($cs)-1] .".php";
      $fileName = $_SERVER['DOCUMENT_ROOT'] . '/'.implode("/",$cr);
      if (file_exists($fileName)) {
         require_once $fileName;

      }
     });