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HomeBackend DevelopmentPHP Tutorial构建自个儿的PHP框架-抽象框架的内容

构建自己的PHP框架--抽象框架的内容

上一篇博客中,我们搭建了一个最简单的框架,从单一入口的public/index.php进入,解析出相应的Controller和Action,去执行,渲染出相应的页面或者输出相应的数据。

但是我们可以看到在public/index.php文件中,是一堆代码,如果之后,我要添加权限/事件等等的机制是不是也要也在这里,那不难想象,不就的将来,index.php就会变成一个巨大无比的php文件。我们当然不想看到这样的情景,所以我们需要将这些内容抽象出来,保持入口文件的简单明了。

那我们要将这些内容抽象到那里去呢?有聪明的同学已经想到了,就是之前在composer.json中定义的位置,我们来看一下composer.json文件:

<span style="color: #000000;">{    </span>"name": "craryprimitiveman/simple-framework"<span style="color: #000000;">,    </span>"description": "A simple php framework"<span style="color: #000000;">,    </span>"license": "MIT"<span style="color: #000000;">,    </span>"authors"<span style="color: #000000;">: [        {            </span>"name": "harrysun"<span style="color: #000000;">,            </span>"email": "[email protected]"<span style="color: #000000;">        }    ],    </span>"require"<span style="color: #000000;">: {},    </span>"autoload"<span style="color: #000000;">: {        </span>"psr-4"<span style="color: #000000;">: {            </span>"sf\\": "src/"<span style="color: #000000;">,            </span>"app\\": ""<span style="color: #000000;">        }    },    </span>"repositories"<span style="color: #000000;">: [        {</span>"type": "composer", "url": "http://packagist.phpcomposer.com"<span style="color: #000000;">},        {</span>"packagist": <span style="color: #0000ff;">false</span><span style="color: #000000;">}    ]}</span>

可以看到autoload里的psr-4里还有个sf\\,他的地址是src/,这就是我们要放抽象出的内容的地方。

有人会问,为什么不直接使用app\\ 作为namespace呢?因为想到之后要将src下的内容做成一个composer包,迁移到vendor中。

下面就正式开始抽象了。

在src下创建两个文件夹,一个是base,一个是web。base用来存放基础的类,web用来存放与web相关的类。因为将来框架可能还要支持php脚本的执行,所以要将base和web分开,将来要加php脚本时,只需要建立一个console的文件夹就好了。

在两个文件夹中分别建立Application.php文件。

先来看在base里的Application.php

<span style="color: #000000;">phpnamespace sf\base;</span><span style="color: #0000ff;">use</span> <span style="color: #0000ff;">Exception</span><span style="color: #000000;">;</span><span style="color: #008000;">/*</span><span style="color: #008000;">* * Application is the base class for all application classes. * @author Harry Sun  </span><span style="color: #008000;">*/</span><span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Application{    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*     * @var string the namespace that controller classes are located in.     * This namespace will be used to load controller classes by prepending it to the controller class name.     * The default namespace is `app\controllers`.     </span><span style="color: #008000;">*/</span>    <span style="color: #0000ff;">public</span> <span style="color: #800080;">$controllerNamespace</span> = 'app\\controllers'<span style="color: #000000;">;    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*     * Runs the application.     * This is the main entrance of an application.     </span><span style="color: #008000;">*/</span>    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> run()    {        </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {            </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$this</span>-><span style="color: #000000;">handleRequest();        } </span><span style="color: #0000ff;">catch</span> (<span style="color: #0000ff;">Exception</span> <span style="color: #800080;">$e</span><span style="color: #000000;">) {            </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$e</span><span style="color: #000000;">;        }    }    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*     * Handles the specified request.     </span><span style="color: #008000;">*/</span>    <span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> handleRequest();}</span>

它是一个抽象类,实现了一个简单的run方法,run方法就是去执行以下handleRequest方法。

它定义了一个抽象方法handleRequest,等待被继承,实现。

它定义了一个controllerNamespace属性,记录controller存放的namesapce,默认值是'app\\controllers'。

再来看在web里的Application.php

<span style="color: #000000;">phpnamespace sf\web;</span><span style="color: #008000;">/*</span><span style="color: #008000;">* * Application is the base class for all application classes. * @author Harry Sun  </span><span style="color: #008000;">*/</span><span style="color: #0000ff;">class</span> Application <span style="color: #0000ff;">extends</span><span style="color: #000000;"> \sf\base\Application{    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*     * Handles the specified request.     * @return Response the resulting response     </span><span style="color: #008000;">*/</span>    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> handleRequest()    {        </span><span style="color: #800080;">$router</span> = <span style="color: #800080;">$_GET</span>['r'<span style="color: #000000;">];        </span><span style="color: #0000ff;">list</span>(<span style="color: #800080;">$controllerName</span>, <span style="color: #800080;">$actionName</span>) = <span style="color: #008080;">explode</span>('/', <span style="color: #800080;">$router</span><span style="color: #000000;">);        </span><span style="color: #800080;">$ucController</span> = <span style="color: #008080;">ucfirst</span>(<span style="color: #800080;">$controllerName</span><span style="color: #000000;">);        </span><span style="color: #800080;">$controllerName</span> = <span style="color: #800080;">$this</span>->controllerNamespace . '\\' . <span style="color: #800080;">$ucController</span> . 'Controller'<span style="color: #000000;">;        </span><span style="color: #800080;">$controller</span> = <span style="color: #0000ff;">new</span> <span style="color: #800080;">$controllerName</span><span style="color: #000000;">();        </span><span style="color: #0000ff;">return</span> <span style="color: #008080;">call_user_func</span>([<span style="color: #800080;">$controller</span>, 'action'. <span style="color: #008080;">ucfirst</span>(<span style="color: #800080;">$actionName</span><span style="color: #000000;">)]);    }}</span>

是不是觉得很眼熟,其实就是将之前放在index.php中的内容放到Application的handleRequest方法里了。

然后我们需要从入口文件调用到这里的代码,这就很简单了,index.php的内容如下:

<span style="color: #000000;">php</span><span style="color: #0000ff;">require_once</span>(__DIR__ . '/../vendor/autoload.php'<span style="color: #000000;">);</span><span style="color: #800080;">$application</span> = <span style="color: #0000ff;">new</span><span style="color: #000000;"> sf\web\Application();</span><span style="color: #800080;">$application</span>->run();

直接去new一个web Application的实例,执行run方法就可以了,是不是很简单。

访问一下:http://localhost/simple-framework/public/index.php?r=site/test,你可以看到上一次一样的结果。

 

好了,今天就先到这里。项目内容和博客内容也都会放到Github上,欢迎大家提建议。

code:https://github.com/CraryPrimitiveMan/simple-framework/tree/0.2

blog project:https://github.com/CraryPrimitiveMan/create-your-own-php-framework

 

2楼阿水
顶一记!
Re: 疯狂的原始人
@阿水,谢谢支持~~
1楼玻璃鱼儿
PHP的命名空间为什么不和JAVA amp; .NET的类似都用点号分割呢??难道不能实现吗?不可能吧。非要独树一帜,看着别扭还难受。
Re: 疯狂的原始人
@玻璃鱼儿,PHP的namespace原生是不支持用点号分割,其实稍微早一点的框架的实现,是使用点号分割的,那时候PHP还没有支持namespace。
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