ClassLoader::register PHP Method

    public function register($prepend = false);

 public function registerClassLoader()
 {
     if (!interface_exists("ClassLoader", false)) {
         require \pocketmine\PATH . "src/spl/ClassLoader.php";
         require \pocketmine\PATH . "src/spl/BaseClassLoader.php";
         require \pocketmine\PATH . "src/pocketmine/CompatibleClassLoader.php";
     }
     if ($this->classLoader !== null) {
         $this->classLoader->register(true);
     }
 }