Zan是基于PHP协程的网络服务框架，提供最简单的方式开发面向C10K+的高并发HTTP服务或SOA服务。

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<?php
namespace Com\Youzan\ZanHttpDemo\Controller\Index;
use Com\Youzan\ZanHttpDemo\DemoModule\Service\System;
use Zan\Framework\Foundation\Domain\HttpController as Controller;
class IndexController extends Controller {
    public function index()
    {
        $systemService = new System(); 
        yield $systemService->sleep(20);
        $this->assign('testResult', 'hello, zanphp!');
        yield $this->display('DemoModule/Test');
    }
}