构建自己的PHP框架--抽象Controller的基类，框架controller
上一篇博客中，我们将简单的路由解析和执行，从入口文件public/index.php中移入到框架中。入口文件顿时变得清爽无比～～
但是，去我们的controller里看一下，会看到如下的code：
<span>public</span> <span>function</span><span> actionView()
{
</span><span>$body</span> = 'Test body information'<span>;
</span><span>require</span> '../views/site/view.php'<span>;
}</span>登入後複製
难道我们每写一个要去渲染页面的action，都要去找相应路径的view，然后把它require进来。肯定不能这样，所以我们要抽象出一个Controller的基类，实现一个渲染页面的方法，让其他的controller继承，就可以使用相应的方法。
不用说，这个controller的基类肯定要写到框架里。而且也要写两个，一个放在base中，一个放在web中，web中的Controller继承base中的。
先来看在base中的
<?<span>php
namespace sf\base;
</span><span>/*</span><span>*
* Controller is the base class for classes containing controller logic.
* @author Harry Sun <sunguangjun@126.com>
</span><span>*/</span>
<span>class</span><span> Controller
{
}</span>登入後複製
只有一个空类，等待添加内容。
再来看web中的
<?<span>php
namespace sf\web;
</span><span>/*</span><span>*
* Controller is the base class for classes containing controller logic.
* @author Harry Sun <sunguangjun@126.com>
</span><span>*/</span>
<span>class</span> Controller <span>extends</span><span> \sf\base\Controller
{
</span><span>/*</span><span>*
* Renders a view
* @param string $view the view name.
* @param array $params the parameters (name-value pairs) that should be made available in the view.
</span><span>*/</span>
<span>public</span> <span>function</span> render(<span>$view</span>, <span>$params</span> =<span> [])
{
</span><span>extract</span>(<span>$params</span><span>);
</span><span>return</span> <span>require</span> '../views/' . <span>$view</span> . '.php'<span>;
}
}</span>登入後複製
可以看到，我们首先从数组中把变量导入到当前的符号表中，然后引入相应的view页面。
然后，在SiteController，我们只需要这么写就可以了。
<?<span>php
namespace app\controllers;
</span><span>use</span><span> sf\web\Controller;
</span><span>class</span> SiteController <span>extends</span><span> Controller
{
</span><span>public</span> <span>function</span><span> actionTest()
{
</span><span>echo</span> 'success!'<span>;
}
</span><span>public</span> <span>function</span><span> actionView()
{
</span><span>$this</span>->render('site/view', ['body' => 'Test body information'<span>]);
}
}</span>登入後複製
然后，访问http://localhost/simple-framework/public/index.php?r=site/view，就可以看到跟之前一样的页面了。
我们来完善一下base中的Controller
<?<span>php
namespace sf\base;
</span><span>/*</span><span>*
* Controller is the base class for classes containing controller logic.
* @author Harry Sun <sunguangjun@126.com>
</span><span>*/</span>
<span>class</span><span> Controller
{
</span><span>/*</span><span>*
* @var string the ID of this controller.
</span><span>*/</span>
<span>public</span> <span>$id</span><span>;
</span><span>/*</span><span>*
* @var Action the action that is currently being executed.
</span><span>*/</span>
<span>public</span> <span>$action</span><span>;
}</span>登入後複製
添加了两个属性，分别来记录当前的controller和action。
然后，我们要在解析router之后，将其赋值，code如下：
<?<span>php
namespace sf\web;
</span><span>/*</span><span>*
* Application is the base class for all application classes.
* @author Harry Sun <sunguangjun@126.com>
</span><span>*/</span>
<span>class</span> Application <span>extends</span><span> \sf\base\Application
{
</span><span>/*</span><span>*
* Handles the specified request.
* @return Response the resulting response
</span><span>*/</span>
<span>public</span> <span>function</span><span> handleRequest()
{
</span><span>$router</span> = <span>$_GET</span>['r'<span>];
</span><span>list</span>(<span>$controllerName</span>, <span>$actionName</span>) = <span>explode</span>('/', <span>$router</span><span>);
</span><span>$ucController</span> = <span>ucfirst</span>(<span>$controllerName</span><span>);
</span><span>$controllerNameAll</span> = <span>$this</span>->controllerNamespace . '\\' . <span>$ucController</span> . 'Controller'<span>;
</span><span>$controller</span> = <span>new</span> <span>$controllerNameAll</span><span>();
</span><span>$controller</span>->id = <span>$controllerName</span><span>;
</span><span>$controller</span>->action = <span>$actionName</span><span>;
</span><span>return</span> <span>call_user_func</span>([<span>$controller</span>, 'action'. <span>ucfirst</span>(<span>$actionName</span><span>)]);
}
}</span>登入後複製
然后我们就可以在controller和view中拿到相应的controller名字和action名字了，将view.php修改如下：
<span><</span><span>html</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>title</span><span>></span>title<span></</span><span>title</span><span>></span>
<span><</span><span>head</span><span>></span>
<span><</span><span>body</span><span>></span>
<span><?</span><span>php echo $this->id;</span><span>?></span><span><</span><span>br</span><span>/></span>
<span><?</span><span>php echo $this->action;</span><span>?></span><span><</span><span>br</span><span>/></span>
<span><?</span><span>php echo $body;</span><span>?></span>
<span></</span><span>body</span><span>></span>
<span></</span><span>html</span><span>></span>登入後複製
然后我们就可以看到如下的页面了
有人觉得现在大家都前后端分离了，我们不需要用PHP去render一个页面，只需要返回一个josn字符串就好了，这个就更简单了，在web的Controller中添加一个toJson方法即可
<span>/*</span><span>*
* Convert a array to json string
* @param string $data
</span><span>*/</span>
<span>public</span> <span>function</span> toJson(<span>$data</span><span>)
{
</span><span>if</span> (<span>is_string</span>(<span>$data</span><span>)) {
</span><span>return</span> <span>$data</span><span>;
}
</span><span>return</span> json_encode(<span>$data</span><span>);
}</span>登入後複製
将SiteController中的actionTest，修改如下：
<span>public</span> <span>function</span><span> actionTest()
{
</span><span>$data</span> = ['first' => 'awesome-php-zh_CN', 'second' => 'simple-framework'<span>];
</span><span>echo</span> <span>$this</span>->toJson(<span>$data</span><span>);
}</span>登入後複製
访问http://localhost/simple-framework/public/index.php?r=site/view，你就可以看到相应的json字符串了。
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/0.3
blog project：https://github.com/CraryPrimitiveMan/create-your-own-php-framework
