Yii ????? ????: ??????? ?? ?? ??? ??? ?? ??

??
????(????)? ??????? ?? ?? ??? ??? ??? ???? Yii ??????? ??? ?????. ????? ???? ???? ??????? ??? ?? ??? ??? ?? ??? ?????. ????? ?? ??? ??, ??, ???? ? ??? ??? ?? ???? ?? ?? ???? ??? ? ????.

Yii ?????? ????? ??? ?? ?????. ??????? ?? ???? ?? ??? ???? ?? ???. ????? ??? ?? Yii ??????? ????? ???? ??? ??? ???????.

Example
Yii ?????? ???? ?? ?? ??????? ????? ??? ?????. ? ????????? MySQL ? Redis? ??? ??? ??? ?? ??? ???? ???. ??? ? ??? ???? ?? ????? ??? ????.

?? ??????? ?? ???? ????? ???? ???. config/main.php ??? ?? ??? ?????:

'comComponents' => [

// ...
'middleware' => [
    'class' => 'yiiwebMiddlewareDispatcher',
    'middlewares' => [
        [
            'class' => 'appmiddlewaresDatabaseMiddleware',
            'db' => 'mysql',
        ],
        [
            'class' => 'appmiddlewaresCacheMiddleware',
            'cache' => 'redis',
        ],
    ],
],
// ...

],

? ????? ???? ??? middlewares ??? ?? ? ?? ????? DatabaseMiddleware? CacheMiddleware? ??????. ?? DatabaseMiddleware? ?????? ?? ??? ???? ? ???? db?? ?? ??? ?? ?????? ??? ?????. CacheMiddleware? ?? ?? ??? ???? ? ???? ?? ??? ???? ?? ??? ????.

???? DatabaseMiddleware? CacheMiddleware? ??? ?? ???? ?? ? ?? ???? ???? ???? ???. app/middlewares ????? ? ?? ?? DatabaseMiddleware.php ? CacheMiddleware.php? ???? ?? ??? ?????:

namespace appmiddlewares;

use yii aseBaseObject;
use yiiwebRequest;
use yiiwebResponse;
use yiidbConnection;

class DatabaseMiddleware? BaseObject? ?????
{

public $db;

public function handle(Request $request, Response $response, $next)
{
    // 執(zhí)行數(shù)據(jù)庫操作
    $connection = new Connection([
        'dsn' => 'mysql:host=localhost;dbname=task_manager',
        'username' => 'root',
        'password' => '',
    ]);
    // ...
    $connection->open();
    // ...
    $connection->close();

    return $next($request, $response);
}

}

class CacheMiddleware? BaseObject? ?????
{

public $cache;

public function handle(Request $request, Response $response, $next)
{
    // 執(zhí)行緩存操作
    $cache = new Cache([
        'class' => 'yiicachingRedisCache',
        'redis' => 'redis',
    ]);
    // ...
    $cache->set('key', 'value');
    // ...
    $cache->delete('key');

    return $next($request, $response);
}

}

? ????? DatabaseMiddleware? CacheMiddleware? ?? ???? ?? ???? ?????? ??? ??? ??????. ??. ? ????? ?? ?????? ?? ?? ??? ?? ??? ??? ? $next($request, $response)? ???? ?? ???? ?? ?? ???? ??? ?????.

????? ????? ?? ??? ???? ?? ??? ???? ????? ??? ? ????.

Yii::$app->middleware->dispatch(Yii::$app->request, Yii: :$app->response, function ($request, $response) {

// 處理程序邏輯

});

? ????? Yii::$app->middleware->dispatch ???? ?? ????? ?????. , ?? ??? ?? ?? ??? ??? ?????. ? ?? ????? ??? ?? ???? ?? ??? ??? ? ????.

??
Yii ??????? ????? ???? ??????? ?? ??? ?? ??? ??? ? ????. ??? ???? ???? ???? ???? ?????? ??? ????? ?? ???? ??? ? ????. ? ?? Yii ?????? ????? ???? ???? ? ??? ??? ????.

? ??? Yii ????? ????: ??????? ?? ?? ??? ???? ?? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!