学习SlimFrameworkforPHPv3(1)

　　因为公司的项目用到是slim 框架，所以想把它学习一下。在公司用到是Slim2版本，现在官网已经到达 Slim3的版本了。官网地址：http://www.cnblogs.com/lmenglliren89php/。

　　首先按照官网的教程，安装Slim：

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

　　　　2.composer require slim/slim "^3.0"

　　这样一个Slim就安装好了。还有Apache的DirectDocumentroot设置：AllowOverride All。

　　同时它自带的Example的例子也是可以运行的，需要调整下文件夹的位置就好。

　　如何才能理解一个框架呢？是很顺利的使用吗？还是从一步步去跟进去它的流程？

　　我的思路是这样的，我把这个Example改成自己的项目，然后在不知道如何去的时候去深挖一下，不知道这样的逻辑是否正确，暂且就这样做吧。

　　项目逻辑要求是这样的，页面提交数据--->>接收数据--->>存入数据库--->>记入日志--->>返回写入成功

　　接收数据的route:

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

　　要说的是Slim就是基于route概念的，它将所有的request都转给不同的route，然后每个route完成功能，最后设定response，请求完毕。

　　get方法就是去设定一个route，以后的‘replace’就会匹配到那个闭包函数中。

　　而这个route是放在哪里呢?在APP.php中有个contianer。这个container是个什么东西呢，来看代码：

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;}

　　来看Container怎么做的：

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);        };    }}

　　会看到这段代码就是初始化container中的router key，以后的route都加到这个里面就好了。

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

　　第一次写，就先这样吧。