lib/Twig/lib/Twig/Autoloader.php
public static function register($prepend = false)
    {
        @trigger_error('Using Twig_Autoloader is deprecated since version 1.21. Use Composer instead.', E_USER_DEPRECATED);

        if (PHP_VERSION_ID < 50300) {
            spl_autoload_register(array(__CLASS__, 'autoload'));
        } else {
            spl_autoload_register(array(__CLASS__, 'autoload'), true, $prepend);
        }
    }
public static function register($prepend = false)
    {
        @trigger_error('Using Twig_Autoloader is deprecated since version 1.21. Use Composer instead.', E_USER_DEPRECATED);

        if (PHP_VERSION_ID < 50300) {
            spl_autoload_register(array(__CLASS__, 'autoload'));
        } else {
            spl_autoload_register(array(__CLASS__, 'autoload'), true, $prepend);
        }
    }
Registers Twig_Autoloader as an SPL autoloader.

@param bool $prepend whether to prepend the autoloader or not