摘要：异步编程基于实现框架说明偶然间在上看到有赞官方仓库的手把手教你实现与。由于此前用过，对于的洋葱模型叹为观止。文档中是基于扩展进行开发，而对并不友好，向来习惯在下开发的我一鼓作气，将改写并兼容了此项目。

PHP异步编程: 基于 PHP 实(chao)现(xi) NODEJS web框架 KOA

偶然间在 GITHUB 上看到有赞官方仓库的 手把手教你实现co与Koa 。由于此前用过 KOA ，对于 KOA 的洋葱模型叹为观止。不由得心血来潮的看完了整个文档，接着 CTRL+C、CTRL+V 让代码跑了起来。
文档中是基于 swoole 扩展进行开发，而 swoole 对 WINDOWS 并不友好，向来习惯在 WINDOWS 下开发的我一鼓作气，将Workerman 改写并兼容了此项目。

PHPKoa Demo 是使用 PHPKoa 开发 HTTP SERVER 的一个简单示例！

composer require naka1205/phpkoa

υse(function(Context $ctx) {
    $ctx->status = 200;
    $ctx->body = "
Hello World
";
});

$app->listen(3000);

υse(new Error());
$app->υse(new NotFound());
$app->υse(new Timeout(3)); //设置3秒超时

$router = new Router();

//正常访问
$router->get("/hello", function(Context $ctx, $next) {
    $ctx->status = 200;
    $ctx->body = "
Hello World
";
});

//访问超时
$router->get("/timeout", function(Context $ctx, $next) {
    yield async_sleep(5);
});

//访问出错
$router->get("/error", function(Context $ctx, $next) {
    $ctx->thrοw(500, "Internal Error");
    yield;
});

$app->υse($router->routes());

$app->listen(3000);

υse(new Error());
$app->υse(new Timeout(5));

$router = new Router();
$router->get("/demo1", function(Context $ctx, $next) {
    $ctx->body = "demo1";
});
$router->get("/demo2", function(Context $ctx, $next) {
    $ctx->body = "demo2";
});
$router->get("/demo3/(d+)", function(Context $ctx, $next, $vars) {
    $ctx->status = 200;
    $ctx->body = "demo3={$vars[0]}";
});
$router->get("/demo4", function(Context $ctx, $next) {
    $ctx->redirect("/demo2");
});

//RESTful API
$router->post("/demo3/(d+)", function(Context $ctx, $next, $vars) {
    //设置 session
    $ctx->setSession("demo3",$vars[0]);
    //设置 cookie
    $ctx->setCookie("demo3",$vars[0]);
    $ctx->status = 200;
    $ctx->body = "post:demo3={$vars[0]}";
});
$router->put("/demo3/(d+)", function(Context $ctx, $next, $vars) {

    //获取单个 cookie
    $cookie_demo3 = $ctx->getCookie("demo3");
    //或者
    $cookies = $ctx->cookies["demo3"];

    //获取单个 session
    $session_demo3 = $ctx->getSession("demo3");
    //或者
    $session = $ctx->session["demo3"];

    $ctx->status = 200;
    $ctx->body = "put:demo3={$vars[0]}";
});
$router->delete("/demo3/(d+)", function(Context $ctx, $next, $vars) {
    //清除所有 cookie
    $ctx->clearCookie();
    //清除所有 session
    $ctx->clearSession();
    $ctx->status = 200;
    $ctx->body = "delete:demo3={$vars[0]}";
});

//文件上传
$router->post("/files/(d+)", function(Context $ctx, $next, $vars) {
    $upload_path = __DIR__ . DS .  "uploads" . DS;
    if ( !is_dir($upload_path) ) {
        mkdir ($upload_path , 0777, true);
    }
    $files = [];
    foreach ( $ctx->request->files as $key => $value) {
        if ( !$value["file_name"] || !$value["file_data"] ) {
            continue;
        }
        $file_path = $upload_path . $value["file_name"];
        file_put_contents($file_path, $value["file_data"]);
        $value["file_path"] = $file_path;
        $files[] = $value;
    }

    $ctx->status = 200;
    $ctx->body = json_encode($files);
});


$app->υse($router->routes());

$app->listen(3000);

mount("/curl", function() use ($router) {
    $client = new Client();
    $router->get("/get", function( Context $ctx, $next ) use ($client) {
        $r = (yield $client->request("GET", "http://127.0.0.1:3000/demo3/1"));
        $ctx->status = $r->getStatusCode();
        $ctx->body = $r->getBody();
    });

    $router->get("/post", function(Context $ctx, $next ) use ($client){
        $r = (yield $client->request("POST", "http://127.0.0.1:3000/demo3/2"));
        $ctx->status = $r->getStatusCode();
        $ctx->body = $r->getBody();
    });

    $router->get("/put", function( Context $ctx, $next ) use ($client){
        $r = (yield $client->request("PUT", "http://127.0.0.1:3000/demo3/3"));
        $ctx->status = $r->getStatusCode();
        $ctx->body = $r->getBody();
    });

    $router->get("/delete", function( Context $ctx, $next ) use ($client){
        $r = (yield $client->request("DELETE", "http://127.0.0.1:3000/demo3/4"));
        $ctx->status = $r->getStatusCode();
        $ctx->body = $r->getBody();
    });
});

//http://127.0.0.1:5000/files
$router->get("/files", function(Context $ctx, $next ) {
    $client = new Client();
    $r = ( yield $client->request("POST", "http://127.0.0.1:3000/files/2", [
        "multipart" => [
            [
                "name"     => "file_name",
                "contents" => fopen( __DIR__ . "/file.txt", "r")
            ],
            [
                "name"     => "other_file",
                "contents" => "hello",
                "filename" => "filename.txt",
                "headers"  => [
                    "X-Foo" => "this is an extra header to include"
                ]
            ]
        ]
    ]));
    
    $ctx->status = $r->getStatusCode();
    $ctx->body = $r->getBody();
});

// $router->get("/curl/(w+)", function(Context $ctx, $next, $vars) {
//     $method = strtoupper($vars[0]);
//     $client = new Client();
//     $r = (yield $client->request($method, "http://127.0.0.1:3000/demo3/123"));
//     $ctx->status = $r->getStatusCode();
//     $ctx->body = $r->getBody();
// });

$app->υse($router->routes());
$app->listen(5000);

    
{title}
    
{time}

υse(new Error());
$app->υse(new Timeout(5));

$router = new Router();
$router->get("/hello", function(Context $ctx) {
    $ctx->status = 200;
    $ctx->state["title"] = "HELLO WORLD";
    $ctx->state["time"] = date("Y-m-d H:i:s", time());;
    yield $ctx->render(__DIR__ . "/hello.html");
});
$app->υse($router->routes());

$app->listen(3000);

    
{title}
    

      
Name
Age
  
      
      

        
 {name} 
        
 {age} 
      
      
  
    

get("/info", function(Context $ctx) {
    $info = array("name" => "小明", "age" => 15);
    $ctx->status = 200;
    $ctx->state["title"] = "这是一个学生信息";
    $ctx->state["info"] = $info;
    yield $ctx->render(__DIR__ . "/info.html");
});

    
{title}
    

      
Name
Age
  
      
      

        
 {name} 
        
 {age} 
      
      
  
    

get("/table", function(Context $ctx) {
    $table = array(
        array("name" => "小明", "age" => 15),
        array("name" => "小花", "age" => 13),
        array("name" => "小刚", "age" => 17)
    );
    $ctx->status = 200;
    $ctx->state["title"] = "这是一个学生名单";
    $ctx->state["table"] = $table;
    yield $ctx->render(__DIR__ . "/table.html");
});

静态文件处理 中间件 PHPKoa Static

υse(new Error());
$app->υse(new Timeout(5));
$app->υse(new NotFound()); 
$app->υse(new StaticFiles(__DIR__ . DS .  "static" )); 

$router = new Router();

$router->get("/index", function(Context $ctx, $next) {
    $ctx->status = 200;
    yield $ctx->render(__DIR__ . "/index.html");
});

$app->υse($router->routes());

$app->listen(3000);