学习Slim Framework for PHP v3 (一)

叶稳
2023-12-01

  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。

 

转载于:https://www.cnblogs.com/lmenglliren89php/p/5149741.html

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