學習Slim Framework for PHP v3 (一)

　　由於公司的項目用到是slim 框架，因此想把它學習一下。在公司用到是Slim2版本，如今官網已經到達 Slim3的版本了。官網地址：http://www.cnblogs.com/lmenglliren89php/。

　　首先按照官網的教程，安裝Slim：

　　　　1.curl -sS https://getcomposer.org/installer | sudo php -- --install-dir=/usr/local/bin --filename=composer

　　　　2.composer require slim/slim "^3.0"

　　這樣一個Slim就安裝好了。還有Apache的DirectDocumentroot設置：AllowOverride All。

　　同時它自帶的Example的例子也是能夠運行的，須要調整下文件夾的位置就好。

　　

　　如何才能理解一個框架呢？是很順利的使用嗎？仍是從一步步去跟進去它的流程？

 

　　個人思路是這樣的，我把這個Example改爲本身的項目，而後在不知道如何去的時候去深挖一下，不知道這樣的邏輯是否正確，暫且就這樣作吧。

　　項目邏輯要求是這樣的，頁面提交數據--->>接收數據--->>存入數據庫--->>記入日誌--->>返回寫入成功

　　接收數據的route:

　　　　

$app->get('/replace/', function ($request, $response, $args) {
   　　　　　　Example\Module\Replace::instance()->setBody($request, $response);

　　　　});

　　

 

　　要說的是Slim就是基於route概念的，它將全部的request都轉給不一樣的route，而後每一個route完成功能，最後設定response，請求完畢。

　　get方法就是去設定一個route，之後的‘replace’就會匹配到那個閉包函數中。

　　

　　而這個route是放在哪裏呢?在APP.php中有個contianer。這個container是個什麼東西呢，來看代碼：

　　

public function __construct($container = [])
{
    if (is_array($container)) {
        $container = new Container($container);
    }
    if (!$container instanceof ContainerInterface) {
        throw new InvalidArgumentException('Expected a ContainerInterface');
    }
    $this->container = $container;
}

　　來看Container怎麼作的：

public function __construct(array $values = [])
{
    parent::__construct($values);

    $userSettings = isset($values['settings']) ? $values['settings'] : [];
    $this->registerDefaultServices($userSettings);
}

private function registerDefaultServices($userSettings)
{
    $defaultSettings = $this->defaultSettings;

    /**
     * This service MUST return an array or an
     * instance of \ArrayAccess.
     *
     * @return array|\ArrayAccess
     */
    $this['settings'] = function () use ($userSettings, $defaultSettings) {
        return new Collection(array_merge($defaultSettings, $userSettings));
    };

    if (!isset($this['environment'])) {
        /**
         * This service MUST return a shared instance
         * of \Slim\Interfaces\Http\EnvironmentInterface.
         *
         * @return EnvironmentInterface
         */
        $this['environment'] = function () {
            return new Environment($_SERVER);
        };
    }

    if (!isset($this['request'])) {
        /**
         * PSR-7 Request object
         *
         * @param Container $c
         *
         * @return ServerRequestInterface
         */
        $this['request'] = function ($c) {
            return Request::createFromEnvironment($c->get('environment'));
        };
    }

    if (!isset($this['response'])) {
        /**
         * PSR-7 Response object
         *
         * @param Container $c
         *
         * @return ResponseInterface
         */
        $this['response'] = function ($c) {
            $headers = new Headers(['Content-Type' => 'text/html; charset=UTF-8']);
            $response = new Response(200, $headers);

            return $response->withProtocolVersion($c->get('settings')['httpVersion']);
        };
    }

    if (!isset($this['router'])) {
        /**
         * This service MUST return a SHARED instance
         * of \Slim\Interfaces\RouterInterface.
         *
         * @return RouterInterface
         */
        $this['router'] = function () {
            return new Router;
        };
    }

    if (!isset($this['foundHandler'])) {
        /**
         * This service MUST return a SHARED instance
         * of \Slim\Interfaces\InvocationStrategyInterface.
         *
         * @return InvocationStrategyInterface
         */
        $this['foundHandler'] = function () {
            return new RequestResponse;
        };
    }

    if (!isset($this['errorHandler'])) {
        /**
         * This service MUST return a callable
         * that accepts three arguments:
         *
         * 1. Instance of \Psr\Http\Message\ServerRequestInterface
         * 2. Instance of \Psr\Http\Message\ResponseInterface
         * 3. Instance of \Exception
         *
         * The callable MUST return an instance of
         * \Psr\Http\Message\ResponseInterface.
         *
         * @param Container $c
         *
         * @return callable
         */
        $this['errorHandler'] = function ($c) {
            return new Error($c->get('settings')['displayErrorDetails']);
        };
    }

    if (!isset($this['notFoundHandler'])) {
        /**
         * This service MUST return a callable
         * that accepts two arguments:
         *
         * 1. Instance of \Psr\Http\Message\ServerRequestInterface
         * 2. Instance of \Psr\Http\Message\ResponseInterface
         *
         * The callable MUST return an instance of
         * \Psr\Http\Message\ResponseInterface.
         *
         * @return callable
         */
        $this['notFoundHandler'] = function () {
            return new NotFound;
        };
    }

    if (!isset($this['notAllowedHandler'])) {
        /**
         * This service MUST return a callable
         * that accepts three arguments:
         *
         * 1. Instance of \Psr\Http\Message\ServerRequestInterface
         * 2. Instance of \Psr\Http\Message\ResponseInterface
         * 3. Array of allowed HTTP methods
         *
         * The callable MUST return an instance of
         * \Psr\Http\Message\ResponseInterface.
         *
         * @return callable
         */
        $this['notAllowedHandler'] = function () {
            return new NotAllowed;
        };
    }

    if (!isset($this['callableResolver'])) {
        /**
         * Instance of \Slim\Interfaces\CallableResolverInterface
         *
         * @param Container $c
         *
         * @return CallableResolverInterface
         */
        $this['callableResolver'] = function ($c) {
            return new CallableResolver($c);
        };
    }
}

　　會看到這段代碼就是初始化container中的router key，之後的route都加到這個裏面就行了。

 $this['router'] = function () {
 　　return new Router;
 };
　
　 只是能不加入本身的Key呢？

　　第一次寫，就先這樣吧。