假设你的项目项目使用composer

1. 安装，为了兼容php5.4使用的是1.x版本

composer require twig/twig:~1.0

2. 封装为trait以集成

namespace objects\Traits;

trait DoufuTwig {

    /**
     * @var \Twig_Environment
     */
    private $twig;

    protected function renderTwig($path, $data = []) {
        if (! $this->twig) {
            $loader = new \Twig_Loader_Filesystem(APPPATH . 'views');
            $this->twig = new \Twig_Environment($loader, 
                array(
                    'cache' => APPPATH . 'cache',
                    'auto_reload' => true
                ));
        }
        
        return $this->twig->render($path, $data);
    }
}

3. 使用

集成到控制器父类

namespace Ncontrollers;

use objects\Traits\DoufuTwig;

abstract class Controller
{
    use DoufuTwig;
}

控制器内使用

...
echo $this->renderTwig('xxx/login.html');
...