加
纯PHP的异步I/O环境，也就是纯PHP的微nodejs实现
例子：
使用新的 HTTPD 类的简单 HTTP 服务器
include "Plus.php" ;
use Plus \ Frame ;
$ frame = new Frame ;
$ httpd = $ frame -> httpd ();
$ httpd -> createServer ( function ( $ request , $ response )
{
$ response -> writeHead ( 200 , [ "Content-Type" => "text/html" ]);
$ response -> write ( "<!DOCTYPE 'html'>" );
$
