The last sentence of the entry script of the Yii application starts the WebApplication

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

CApplication:

public function run()
{
    $this->onBeginRequest(new CEvent($this));
    $this->processRequest();
    $this->onEndRequest(new CEvent($this));
}

processRequest () starts processing the request, implemented by CWebApplication:

public function processRequest()
{
    if(is_array($this->catchAllRequest) && isset($this->catchAllRequest[0]))
    {
        $route=$this->catchAllRequest[0];
        foreach(array_splice($this->catchAllRequest,1) as $name=>$value)
            $_GET[$name]=$value;
    }
    else
        $route=$this->getUrlManager()->parseUrl($this->getRequest());
    $this->runController($route);
}

urlManager application component's parseUrl() creates $route (a string in the form of controllerID/actionID), and runController() creates a Controller object to start processing http requests. The value of

$route may have the following situations:
- empty: replaced by defaultController value;
- “moduleID/controllerID/actionID”:
- “controllerID under module /actionID”: The most common form
- “folder1/folder2/controllerID/actionID” Controller in a multi-level directory

runController first calls createController() to create a controller object

public function createController($route,$owner=null)
{
    // $owner為空則設(shè)置為$this，即 $_app對(duì)象
    if($owner===null)
        $owner=$this;
    // $route為空設(shè)置為defaultController，在$config里配置
    if(($route=trim($route,’/'))===”)
        $route=$owner->defaultController;
    $caseSensitive=$this->getUrlManager()->caseSensitive;
 
    $route.=’/';
    // 逐一取出 $route 按 ‘/’分割后的第一段進(jìn)行處理
    while(($pos=strpos($route,’/'))!==false)
    {
        // $id 里存放的是 $route 第一個(gè) ‘/’前的部分
        $id=substr($route,0,$pos);
        if(!preg_match(‘/^\w+$/’,$id))
            return null;
        if(!$caseSensitive)
            $id=strtolower($id);
        // $route 存放’/’后面部分
        $route=(string)substr($route,$pos+1);
        if(!isset($basePath)) // 完整$route的第一段
        {
            // 如果$id在controllerMap[]里做了映射
            // 直接根據(jù)$id創(chuàng)建controller對(duì)象
            if(isset($owner->controllerMap[$id]))
            {
                return array(
                    Yii::createComponent($owner->controllerMap[$id],$id,$owner===$this?null:$owner),
                    $this->parseActionParams($route),
                );
            }
 
            // $id 是系統(tǒng)已定義的 module，根據(jù)$id取得module對(duì)象作為$owner參數(shù)來(lái)createController
            if(($module=$owner->getModule($id))!==null)
                return $this->createController($route,$module);
            // 控制器所在的目錄
            $basePath=$owner->getControllerPath();
            $controllerID=”;
        }
        else
            $controllerID.=’/';
        $className=ucfirst($id).’Controller’;
        $classFile=$basePath.DIRECTORY_SEPARATOR.$className.’.php’;
        // 控制器類(lèi)文件存在，則require并創(chuàng)建控制器對(duì)象&返回
        if(is_file($classFile))
        {
            if(!class_exists($className,false))
            require($classFile);
            if(class_exists($className,false) && is_subclass_of($className,’CController’))
            {
                $id[0]=strtolower($id[0]);
                return array(
                    new $className($controllerID.$id,$owner===$this?null:$owner),
                    $this->parseActionParams($route),
                );
            }
            return null;
        }
        // 未找到控制器類(lèi)文件，可能是多級(jí)目錄，繼續(xù)往子目錄搜索
        $controllerID.=$id;
        $basePath.=DIRECTORY_SEPARATOR.$id;
    }
}

createController() returns a created controller object and actionID. runController() calls the controller's init() method and run($actionID) to run the controller:

public function runController($route)
{
    if(($ca=$this->createController($route))!==null)
    {
        list($controller,$actionID)=$ca;
        $oldController=$this->_controller;
        $this->_controller=$controller;
        $controller->init();
        $controller->run($actionID);
        $this->_controller=$oldController;
    }
    else
        throw new CHttpException( 404, Yii::t(‘yii’,'Unable to resolve the request “{route}”.’, array( ‘{route}’=>$route===” ? $this->defaultController:$route)));
    }

$controller->init (), there is no action. The Action object is first created in run():

public function run($actionID)
{
    if(($action=$this->createAction($actionID))!==null)
    {
       if(($parent=$this->getModule())===null)
           $parent=Yii::app();
       if($parent->beforeControllerAction($this,$action))
       {
           $this->runActionWithFilters($action,$this->filters());
           $parent->afterControllerAction($this,$action);
       }
    }
    else
        $this->missingAction($actionID);
}

$controller->run($actionID):

public function createAction($actionID)
{
    // 為空設(shè)置為defaultAction
    if($actionID===”)
        $actionID=$this->defaultAction;
    // 控制器里存在 ‘a(chǎn)ction’.$actionID 的方法，創(chuàng)建CInlineAction對(duì)象
    if(method_exists($this,’action’.$actionID) && strcasecmp($actionID,’s')) // we have actions method
        return new CInlineAction($this,$actionID);
    // 否則根據(jù)actions映射來(lái)創(chuàng)建Action對(duì)象
    else
        return $this->createActionFromMap($this->actions(),$actionID,$actionID);
}

Here you can see that the controller is not directly The action method is called, but an Action object is needed to run the controller action. This unifies the processing of actions by the action object mapped by the controller method and actions. That is, both forms of action processing are unified into the run( of the IAction interface). )transfer.

The IAction interface requires the implementation of three methods: run(), getId(), and getController (). The CAction class provided by Yii requires the constructor to provide the Controller and Id and implements the processing of getId() and getController (). The Action class can inherit from CAction.

CInlineAction is a very simple process under web/action. It calls the action method of the Controller:

class CInlineAction extends CAction
{
    public function run()
    {
        $method=’action’.$this->getId();
        $this->getController()->$method();
    }
}

Return to $controller->run($actionID)

public function run($actionID)
{
    if(($action=$this->createAction($actionID))!==null)
    {
        if(($parent=$this->getModule())===null)
            $parent=Yii::app();
        if($parent->beforeControllerAction($this,$action))
        {
            $this->runActionWithFilters($action,$this->filters());
            $parent->afterControllerAction($this,$action);
        }
    }
    else
        $this->missingAction($actionID);
}

Yii::app()->beforeControllerAction() actually returns true, so the action object is actually run through the controller's runActionWithFilters()

public function runActionWithFilters($action,$filters)
{
    // 控制器里沒(méi)有設(shè)置過(guò)濾器
    if(empty($filters))
        $this->runAction($action);
    else
    {
        // 創(chuàng)建過(guò)濾器鏈對(duì)象并運(yùn)行
        $priorAction=$this->_action;
        $this->_action=$action;
        CFilterChain::create($this,$action,$filters)->run();
        $this->_action=$priorAction;
    }
}

No filter , runAction() is the run() method that ultimately calls the previously created action object:

public function runAction($action)
{
    $priorAction=$this->_action;
    $this->_action=$action;
    if($this->beforeAction($action))
    {
        $action->run();
        $this->afterAction($action);
    }
    $this->_action=$priorAction;
}

Each filter must implement the IFilter interface, and the preFilter() method implemented by the filter is in $action->run( ), if it is judged that the action can be executed, it will return true, otherwise it will return false

if($filter1->preFilter())
if($filter2->preFilter())
if($filtern->preFilter())
$action->run()
$filtern->postFilter()
$filter2->postFilter()
$filter1- >postFilter()

The most common operation in action is to render the view file: renderPartial() and render(). render() will put the result into the layout file after processing the view file.

public function renderPartial($view,$data=null,$return=false,$processOutput=false)
{
    if(($viewFile=$this->getViewFile($view))!==false)
    {
        $output=$this->renderFile($viewFile,$data,true);
        if($processOutput)
            $output=$this->processOutput($output);
        if($return)
            return $output;
        else
            echo $output;
    }
    else
        throw new CException(Yii::t(‘yii’,'{controller} cannot find the requested view “{view}”.’,
            array(‘{controller}’=>get_class($this), ‘{view}’=>$view)));
}

getViewFile($view) gets the full path of $view:
$view starts with '/', uses the system views directory as the starting directory +$view+.php
$view contains For aliases, find the real path of the alias
Others use the modele view directory as the starting directory+$view+.php

If the third-party renderer is not configured in $config, the actual value in renderFile() is The renderInternal() provided by Yii itself is called to render the view file:

public function renderFile($viewFile,$data=null,$return=false)
{
    $widgetCount=count($this->_widgetStack);
    // 如果配置了其他的ViewRenderer
    if(($renderer=Yii::app()->getViewRenderer())!==null)
        $content=$renderer->renderFile($this,$viewFile,$data,$return);
    else
        // yii 自身的render
        $content=$this->renderInternal($viewFile,$data,$return);
    if(count($this->_widgetStack)===$widgetCount)
        return $content;
    else
    {
        $widget=end($this->_widgetStack);
        throw new CException(Yii::t(‘yii’,'{controller} contains improperly nested widget tags in its view “{view}”. A {widget} widget does not have an endWidget() call.’,array(‘{controller}’=>get_class($this), ‘{view}’=>$viewFile, ‘{widget}’=>get_class($widget))));
    }
}

Yii's renderer uses PHP itself as the template system:

public function renderInternal($_viewFile_,$_data_=null,$_return_=false)
{
    // extract函數(shù)將$_data_從數(shù)組中將變量導(dǎo)入到當(dāng)前的符號(hào)表
    if(is_array($_data_))
        extract($_data_,EXTR_PREFIX_SAME,’data’);
    else
        $data=$_data_;
    if($_return_)
    {
        ob_start();
        ob_implicit_flush(false);
        require($_viewFile_);
        return ob_get_clean();
    }
    else
        require($_viewFile_);
}

render() actually renders the Partial view first file, then renderFile layoutfile, and pass in the result of the view file as the $content variable.

public function render($view,$data=null,$return=false)
{
    $output=$this->renderPartial($view,$data,true);
    if(($layoutFile=$this->getLayoutFile($this->layout))!==false)
        $output=$this->renderFile($layoutFile,array(‘content’=>$output),true);
 
    $output=$this->processOutput($output);
 
    if($return)
        return $output;
    else
        echo $output;
}

processOutput processes the render results, such as adding css or js scripts to the head.

public function processOutput ($output)
{
    Yii::app()->getClientScript()->render($output);
 
    // if using page caching, we should delay dynamic output replacement
    if($this->_dynamicOutput!==null && $this->isCachingStackEmpty())
        $output=$this->processDynamicOutput($output);
 
    if($this->_pageStates===null)
        $this->_pageStates=$this->loadPageStates();
    if(!empty($this->_pageStates))
        $this->savePageStates($this->_pageStates,$output);
 
    return $output;
}

The above is the detailed analysis of Yii framework analysis (4) - WebApplication's run function. For more related content, please pay attention to the PHP Chinese website (www.miracleart.cn)!