学习Slim Framework for PHP v3 (一)
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。
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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。
