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Build your own PHP framework--the base class of abstract Controller_PHP tutorial

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2016-07-12 09:08:36919browse

构建自己的PHP框架--抽象Controller的基类

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:
 
    public function actionView()
    {
        $body = 'Test body information';
        require '../views/site/view.php';
    }
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
 
 
<?php
namespace sf\base;

/**
 * Controller is the base class for classes containing controller logic.
 * @author Harry Sun <sunguangjun@126.com>
 */
class Controller
{
}

 

 
 
只有一个空类,等待添加内容。
 
再来看web中的
 
 
<?php
namespace sf\web;

/**
 * Controller is the base class for classes containing controller logic.
 * @author Harry Sun <sunguangjun@126.com>
 */
class Controller extends \sf\base\Controller
{
    /**
     * Renders a view
     * @param string $view the view name.
     * @param array $params the parameters (name-value pairs) that should be made available in the view.
     */
    public function render($view, $params = [])
    {
        extract($params);
        return require &#39;../views/&#39; . $view . &#39;.php&#39;;
    }
}

 

 
 
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。
 
 
<?php
namespace app\controllers;

use sf\web\Controller;

class SiteController extends Controller
{
    public function actionTest()
    {
        echo &#39;success!&#39;;
    }

    public function actionView()
    {
        $this->render(&#39;site/view&#39;, [&#39;body&#39; => &#39;Test body information&#39;]);
    }
}
 

 

 
然后,访问www.Bkjia.com,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
 
 
<?php
namespace sf\base;

/**
 * Controller is the base class for classes containing controller logic.
 * @author Harry Sun <sunguangjun@126.com>
 */
class Controller
{
    /**
     * @var string the ID of this controller.
     */
    public $id;
    /**
     * @var Action the action that is currently being executed.
     */
    public $action;
}

 

 
 
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:
 
 
<?php
namespace sf\web;

/**
 * Application is the base class for all application classes.
 * @author Harry Sun <sunguangjun@126.com>
 */
class Application extends \sf\base\Application
{
    /**
     * Handles the specified request.
     * @return Response the resulting response
     */
    public function handleRequest()
    {
        $router = $_GET[&#39;r&#39;];
        list($controllerName, $actionName) = explode(&#39;/&#39;, $router);
        $ucController = ucfirst($controllerName);
        $controllerNameAll = $this->controllerNamespace . &#39;\\&#39; . $ucController . &#39;Controller&#39;;
        $controller = new $controllerNameAll();
        $controller->id = $controllerName;
        $controller->action = $actionName;
        return call_user_func([$controller, &#39;action&#39;. ucfirst($actionName)]);
    }
}

 

 
 
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:
 
 
<html>
    <head>
        <title>title</title>
    <head>
    <body>
        <?php echo $this->id;?><br/>
        <?php echo $this->action;?><br/>
        <?php echo $body;?>
    </body>
</html>
 

 

 
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
 
 
    /**
     * Convert a array to json string
     * @param string $data
     */
    public function toJson($data)
    {
        if (is_string($data)) {
            return $data;
        }
        return json_encode($data);
    }

 

 
 
将SiteController中的actionTest,修改如下:
 
    public function actionTest()
    {
        $data = ['first' => 'awesome-php-zh_CN', 'second' => 'simple-framework'];
        echo $this->toJson($data);
    }

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