YII 的源码分析(-),yii源码分析_PHP教程

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풀어 주다: 2016-07-13 10:12:10
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YII 的源码分析(-),yii源码分析

做为源码分析的首秀,我就挑了yii(读作歪依依而不是歪爱爱);它的赞美之词我就不多说了,直接入正题。先准备材料,建议直从官网下载yii的源码包(1.1.15)最新版本。

在demos里边有一个最简单的应用—helloworld.就是用yii框架输出一句话:”hello world”;

我就从它下手,分析框架执行一个最小流程要经过哪些组件,浅析它的运行过程。

首先从单一入口文件开始阅读。(源码一般都是从调用处开始分析)

Index.php->

// include Yii bootstrap file

//引入启动文件

require_once(dirname(__FILE__).'/../../framework/yii.php');

 

yii.php ->

//YiiBase is a helper class serving common framework functionalities.

//YiiBase是一个助手类,它服务于整个框架。 这里定义了许多重要的常量

require(dirname(__FILE__).'/YiiBase.php');

//注册自动加载类

spl_autoload_register(array('YiiBase','autoload'));

//导入接口类

require(YII_PATH.'/base/interfaces.php');

//启动应用

Yii::createWebApplication()->run();

代码到这里似乎就终结了,页面的内容也程现出来,可是框架到底做了些什么,我们却一无所知。所以我们需要把这一步进行分解,把里边的细节暴露出来。

Yii::createWebApplication()->run() 一共可以分成三部分

Yii 这个东西是什么?

从yii.php 可以找到这样一行代码class Yii extends YiiBase

说明它就是YiiBase的继承类,而且作者的扩展是留空的,所以Yii就是YiiBase的一个引用而已。所以createWebApplication这个静态方法也得去YiiBase中查找了。

在YiiBase.php中,很容易就发现了这个方法:

public static function createWebApplication($config=null)

         {

                   return self::createApplication('CWebApplication',$config);

         }

它又把任务传递给了createApplication:

         public static function createApplication($class,$config=null)

         {

                   return new $class($config);

         }

结合起来看,createWebApplication () 就是return new CWebApplication($config);

这个CWebApplication类又在哪呢?它又是怎么引入的呢?

带着一系列的问题,我又回到了YiiBase.php

那里边定义了一个很长的数组,你可以找到:

'CWebApplication' => '/web/CWebApplication.php',这就是自动加载类中的一员

关于它是如何实现自动加载的,可以查看spl_autoload_register的相关文档,此处就节外生枝了.

 

我们继续往CWebApplication这个里边深挖。打开/web/CWebApplication.php这个文件。

前面提到return new CWebApplication($config);根据我的经验,用了new ,通常会有一个构造函数的,但我却没有找到它的构造函数,肯定是在它的父类中,于是我往上找,class CWebApplication extends CApplication 果然被我发现了,这就跟挖泥鳅一样的,得顺着线索一点点的找,要有耐心。

 

CApplication 中果然有构造函数,代码如下:

<span><span>public</span> <span>function</span> __construct(<span>$config</span>=<span>null</span><span>)

         {

                   Yii</span>::setApplication(<span>$this</span><span>);

 

                   </span><span>//</span><span> set basePath at early as possible to avoid trouble</span>

                   <span>if</span>(<span>is_string</span>(<span>$config</span><span>))

                            </span><span>$config</span>=<span>require</span>(<span>$config</span><span>);

                   </span><span>if</span>(<span>isset</span>(<span>$config</span>['basePath'<span>]))

                   {

                            </span><span>$this</span>->setBasePath(<span>$config</span>['basePath'<span>]);

                            </span><span>unset</span>(<span>$config</span>['basePath'<span>]);

                   }

                   </span><span>else</span>

                            <span>$this</span>->setBasePath('protected'<span>);

                   Yii</span>::setPathOfAlias('application',<span>$this</span>-><span>getBasePath());

                   Yii</span>::setPathOfAlias('webroot',<span>dirname</span>(<span>$_SERVER</span>['SCRIPT_FILENAME'<span>]));

                   </span><span>if</span>(<span>isset</span>(<span>$config</span>['extensionPath'<span>]))

                   {

                            </span><span>$this</span>->setExtensionPath(<span>$config</span>['extensionPath'<span>]);

                            </span><span>unset</span>(<span>$config</span>['extensionPath'<span>]);

                   }

                   </span><span>else</span><span>

                            Yii</span>::setPathOfAlias('ext',<span>$this</span>->getBasePath().DIRECTORY_SEPARATOR.'extensions'<span>);

                   </span><span>if</span>(<span>isset</span>(<span>$config</span>['aliases'<span>]))

                   {

                            </span><span>$this</span>->setAliases(<span>$config</span>['aliases'<span>]);

                            </span><span>unset</span>(<span>$config</span>['aliases'<span>]);

                   }</span></span>
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//以上都可以看成是初始化,设置类的引用,别名,路径什么的。

$this->preinit();//暂时未发现有什么用,估计是留给后面扩展用的

$this->initSystemHandlers();//设置错误处理

$this->registerCoreComponents();//注册核心组件

$this->configure($config); //通过配置文件扩展类的属性,为空的时候什么也不做

$this->attachBehaviors($this->behaviors);

$this->preloadComponents();

$this->init();

}

$this下面的某些方法,在当前类是找不到的,因为它们可能是来自父类,最简单的方法就是ctrl+f搜索一下,没有就去类的声明处查看:

abstract class CApplication extends CModule

显然要进入CModule,如果此时还找不到想要方法,那么继续上一过程:

abstract class CModule extends CComponent

直到class CComponent

说明这就是当前这些家伙的老巢了。从代码的中注释中也可以看到:

CComponent is the base class for all components

说明我的想法是正确的,没错,它就是基类。

透过代码,我们可以发现,我们当前的应用,因为很多参数是空,所以很多逻辑都是直接跳过的。

看到这,$this的内容也大致明了啦。我们再回头看看

return new CWebApplication($config)->run();

通过前面的层层分析,此时的run方法也很好找了。就在CApplication 里边:

<span><span>public</span> <span>function</span><span> run()

         {

                   </span><span>if</span>(<span>$this</span>->hasEventHandler('onBeginRequest'<span>)){

                            </span><span>$this</span>->onBeginRequest(<span>new</span> CEvent(<span>$this</span><span>));

                   }

 

                   </span><span>register_shutdown_function</span>(<span>array</span>(<span>$this</span>,'end'),0,<span>false</span><span>);

                   </span><span>$this</span>-><span>processRequest();  

                   </span><span>if</span>(<span>$this</span>->hasEventHandler('onEndRequest'<span>)){

                            </span><span>$this</span>->onEndRequest(<span>new</span> CEvent(<span>$this</span><span>));

                   }

 

         }</span></span>
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重点放在:$this->processRequest(); 因为前面和后面部分都是注册事件相关的,当前条件下执行不到。

<span><span>abstract</span> <span>public</span> <span>function</span> processRequest(); 这个方法在当前类中是抽象的,所以肯定在它的子类中实现了。回去找CWebApplication:

         <span>public</span> <span>function</span><span> processRequest()

         {

                   </span><span>if</span>(<span>is_array</span>(<span>$this</span>->catchAllRequest) && <span>isset</span>(<span>$this</span>->catchAllRequest[0<span>]))

                   {

                            </span><span>$route</span>=<span>$this</span>->catchAllRequest[0<span>];

                            </span><span>foreach</span>(<span>array_splice</span>(<span>$this</span>->catchAllRequest,1) <span>as</span> <span>$name</span>=><span>$value</span><span>)

                                     </span><span>$_GET</span>[<span>$name</span>]=<span>$value</span><span>;

                   }

                   </span><span>else</span>

                            <span>$route</span>=<span>$this</span>->getUrlManager()->parseUrl(<span>$this</span>-><span>getRequest());

 

                   </span><span>$this</span>->runController(<span>$route</span><span>);

         }</span></span>
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注意重点在$this->runController($route);

<span><span>public</span> <span>function</span> runController(<span>$route</span><span>)

         {

                   </span><span>if</span>((<span>$ca</span>=<span>$this</span>->createController(<span>$route</span>))!==<span>null</span><span>)

                   {

                            </span><span>list</span>(<span>$controller</span>,<span>$actionID</span>)=<span>$ca</span><span>;

 

                            </span><span>$oldController</span>=<span>$this</span>-><span>_controller;

                            </span><span>$this</span>->_controller=<span>$controller</span><span>;

                            </span><span>$controller</span>-><span>init();

                            </span><span>$controller</span>->run(<span>$actionID</span><span>);

                            </span><span>$this</span>->_controller=<span>$oldController</span><span>;

                   }

                   </span><span>else</span>

                            <span>throw</span> <span>new</span> CHttpException(404,Yii::t('yii','Unable to resolve the request "{route}".',

                                     <span>array</span>('{route}'=><span>$route</span>===''?<span>$this</span>->defaultController:<span>$route</span><span>)));

         }</span></span>
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我们要注意的代码只有两行:

$controller->init();

$controller->run($actionID);

这里的$controller可以能过查看createController得知,就是默认的控制器Sitecontroller.php

而Action则是index,你问我是怎么看出来的?哈哈,我在猜不出来的地方echo或var_dump一下不就可以了吗?这么简单的逻辑,还轮不到xdebug 这样的神器出场。

显然,init什么也没有做,看看run做了什么

Sitecontroller中没有run方法,又要去它的父类中查找。

class SiteController extends CController

在CController中有这个方法:

<span><span>public</span> <span>function</span> run(<span>$actionID</span><span>)

         {

                   </span><span>if</span>((<span>$action</span>=<span>$this</span>->createAction(<span>$actionID</span>))!==<span>null</span><span>)

                   {

                            </span><span>if</span>((<span>$parent</span>=<span>$this</span>->getModule())===<span>null</span><span>){

                                     </span><span>$parent</span>=Yii::<span>app();

                            }

 

                            </span><span>if</span>(<span>$parent</span>->beforeControllerAction(<span>$this</span>,<span>$action</span><span>))

                            {

                                     </span><span>$this</span>->runActionWithFilters(<span>$action</span>,<span>$this</span>-><span>filters());

                                     </span><span>$parent</span>->afterControllerAction(<span>$this</span>,<span>$action</span><span>);

                            }

                   }

                   </span><span>else</span>

                            <span>$this</span>->missingAction(<span>$actionID</span><span>);

         }

 </span></span>
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能过查看$this->createAction($actionID),得到return new CInlineAction($this,$actionID);

我们呆会再看这个CInlineAction,先看$this->runActionWithFilters($action,$this->filters());

<span><span>public</span> <span>function</span> runActionWithFilters(<span>$action</span>,<span>$filters</span><span>)

         {

                   </span><span>if</span>(<span>empty</span>(<span>$filters</span><span>)){

                            </span><span>$this</span>->runAction(<span>$action</span><span>);

                   }

                   </span><span>else</span><span>

                   {

                            </span><span>$priorAction</span>=<span>$this</span>-><span>_action;

                            </span><span>$this</span>->_action=<span>$action</span><span>;

                            CFilterChain</span>::create(<span>$this</span>,<span>$action</span>,<span>$filters</span>)-><span>run();

                            </span><span>$this</span>->_action=<span>$priorAction</span><span>;

                   }

         }</span></span>
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显然$filters是空的,所以执行第一个表达式$this->runAction($action);

<span><span>public</span> <span>function</span> runAction(<span>$action</span><span>)

         {

 

                   </span><span>$priorAction</span>=<span>$this</span>-><span>_action;

                   </span><span>$this</span>->_action=<span>$action</span><span>;

                   </span><span>if</span>(<span>$this</span>->beforeAction(<span>$action</span><span>))

                   {

 

                            </span><span>if</span>(<span>$action</span>->runWithParams(<span>$this</span>->getActionParams())===<span>false</span><span>){

                                     </span><span>$this</span>->invalidActionParams(<span>$action</span><span>);

                            }

 

                            </span><span>else</span><span>{

                                     </span><span>$this</span>->afterAction(<span>$action</span><span>);

 

                            }

 

                   }

                   </span><span>$this</span>->_action=<span>$priorAction</span><span>;

         }</span></span>
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这段代码的重点是 $action->runWithParams($this->getActionParams())这一句;

这里的$action就是$this->createAction($actionID)返回的结果,而它的结果就是

return new CInlineAction($this,$actionID);

CInlineAction.php

是时候查看CInlineAction了;

<span> <span>public</span> <span>function</span> runWithParams(<span>$params</span><span>)

         {

                   </span><span>$methodName</span>='action'.<span>$this</span>-><span>getId();

                   </span><span>$controller</span>=<span>$this</span>-><span>getController();

                   </span><span>$method</span>=<span>new</span> ReflectionMethod(<span>$controller</span>, <span>$methodName</span><span>);

                   </span><span>if</span>(<span>$method</span>->getNumberOfParameters()>0<span>)

                            </span><span>return</span> <span>$this</span>->runWithParamsInternal(<span>$controller</span>, <span>$method</span>, <span>$params</span><span>);

                   </span><span>else</span>

                            <span>return</span> <span>$controller</span>-><span>$methodName</span><span>();

         }</span></span>
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哇哦,好高级,居然还用了反射,不过我喜欢!

不过呢,打印$method发现:

object(ReflectionMethod)#6 (2) {

["name"]=>

string(11) "actionIndex"

["class"]=>

string(14) "SiteController"

}

没有参数,所以此处代码相当于是执行了SiteController->actionIndex();

在class SiteController extends CController中可以看到actionIndex 的定义

<span> <span>public</span> <span>function</span><span> actionIndex()

         {

                   </span><span>echo</span> 'Hello World'<span>;

         }</span></span>
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于是就看到屏幕上那一句Hello World ,整个程序也就跑完了。也许有人要问了,为什么输出一句话还这么复杂,不是脱了裤子打屁吗? (请允许我的粗俗);

如果是这么简单的需求,当然不可能这么干。举这个例子,只是说明yii的基础流程,为下面的复杂应用做一个过渡。

Yii作为一个优秀的oop框架,这个例子只是介绍了它的继承,接口,mvc中的vc特性,关于数据模型,我将在后面的分析中陆续给出。最终的目标,是利用yii框架简化我们的开发过程。

好了,今天的分析就在到了,如果有什么不妥的,请留言,如果觉得有帮助,请顺手点个推荐!

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/924356.htmlTechArticleYII 的源码分析(-),yii源码分析 做为源码分析的首秀,我就挑了yii(读作歪依依而不是歪爱爱);它的赞美之词我就不多说了,直接入正题。先...
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