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MVC in php

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Release: 2016-06-06 19:48:58
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控制器,有的地方又称之为Action。 它是MVC中的C,控制视图展现 它会担负很多任务。要接受请求,要选择M处理,最后选择V来显示。 一般在php中大多数情况下他都作为业务的处理层了。 比如对传入参数进行处理,对显示元素进行组装。 它的实现一般也两类 通过对

控制器,有的地方又称之为Action。

它是MVC中的C,控制视图展现

它会担负很多任务。要接受请求,要选择M处理,最后选择V来显示。
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一般在php中大多数情况下他都作为业务的处理层了。
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比如对传入参数进行处理,对显示元素进行组装。
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它的实现一般也两类
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通过对象的映射或者是通过文件包含的形式
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最简单当然就是通过文件包含的形式。
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比如访问index.php/aa/bb/cc
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可以让程序加载aa目录下的bb文件
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然后之后的作为参数注入,这个过程在路由模块中实现
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另外的一种就是通过类的方式
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一般说来以类方式实现的控制器大致会长成这样
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<span><span><span></span></span>php</span>

<span>class</span> IndexController <span>extends</span> CController{

    <span>public function</span> sae() {
        <span>echo</span> <span>'Hello'</span>;    
    }

}
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现在有一个请求index.php/index/sae
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怎样路由到它上面呢? 
 
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方法也是多种多样的~ 
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首先我可以从url上得到参数
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<span>$action</span> = <span>'index'</span>;
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<span>$method</span> = <span>'sae'</span>;
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然后通过$ac = new $action();
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可以得到一个新的IndexController实例
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然后再调用$ac->$method();
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就阔以了。
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另外的方式就是通过反射来实现。
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以上两种方式都会出现一个问题,如果我即将包含的这个文件IndexController.php中包含错误
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或者是在sae() (执行过程中) 出现了错误被终止。我怎样去捕获它呢?
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在php的oop中,exception的处理并没有java那样严格。不会强制要求throws Exception
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比如以下的例子
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class a { 
    
    public function expt() { 
        throw new Exception('wa!');        
    } 
}

class c { 
    
    public function combinea() { 
        $a = new a(); 
        $a->expt(); 
    } 
}

$c = new c(); 
$c->combinea();

它会抛出一个<strong>Fatal error: Uncaught exception 'Exception'</strong>
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但是在php5.2的某些版本,他什么都不会输出,而且你也不能用try catch来捕获$c->combinea()抛出的异常。
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最怕的不是出错,而是出了错什么都没有记录。增加了你debug的难度。
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Copy after login
然后是另外一个问题~
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如果我想要访问的地址是
Copy after login
 
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index.php/index/list
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<span><span><span></span></span>php</span> 
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    <span>class</span> IndexController <span>extends</span> CController{ 
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<span>        public function</span> <span>list</span>() { 
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            <span>echo</span> <span>'Hello'</span>; 
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        } 
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    }
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注意!  list这个词是php的预留词,所以这个文件语法有问题,包含的时候就会报错。
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Copy after login
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一些框架的解决方案是方法前统一加个词 比如action
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控制器大致是这样的
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<span><span><span></span></span>php</span> 
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    <span>class</span> IndexController <span>extends</span> CController{ 
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<span>        public function</span> <span>actionlist()</span> { 
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            <span>echo</span> <span>'Hello'</span>; 
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        } 
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    }
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Controller也会需要参数的获取,模型载入,库载入等等工作。
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所以框架对这层进行封装,这些工作会在基类CController上实现。
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这也是为什么90%的框架都需要让你继承它的基类。
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比如获取参数,涉及到安全性,在框架层面就可以容易封装。
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