Yii framework source code analysis and creation of controller code_PHP tutorial

The URL path using the Yii framework is generally in the form of hostname/?r=xxxx/xxxx/xxxx&sdfs=dsfdsf

We can see that sometimes the controller in the protected directory is used, and sometimes the controller in the module is used. Specifically, how As for processing, please see the following analysis:

The following code is excerpted from the yii framework core code %Yiiroot%/framework/web/CWebApplication.php

Copy code The code is as follows:

================================== ================================================== =============
//1.runController is a method to execute a controller, $route is $_GET['r']
public function runController($route)
{
//Call createController here to create a controller instance first. It can be seen that createController is the key to selecting a controller
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:$route)));
}
================================== ================================================== ===============
//2. Next we analyze createController, assuming that the route we access is site/contact
public function createController($route,$owner= null)
{
//When entering this function for the first time, the $owner parameter is empty
if($owner===null)
$owner=$this;
//If $route If the parameter does not contain /, then use the default controller
if(($route=trim($route,'/'))==='')
$route=$owner->defaultController;
$caseSensitive=$this->getUrlManager()->caseSensitive;
//In order to run the following loop completely, add a / after $route
$route.='/';
//Save the position of / in $pos
while(($pos=strpos($route,'/'))!==false)
{
//$id is the first half part, that is, site
$id=substr($route,0,$pos);
if(!preg_match('/^w+$/',$id))
return null;
if(!$caseSensitive)
$id=strtolower($id);
//$route becomes the second half, that is, contact
$route=(string)substr($route,$pos+ 1);
//Controller root directory or subdirectory prefix
if(!isset($basePath)) // first segment
{
//First time entry, $owner is empty, there is no this Member variable
//If you are not entering for the first time or $owner has a value, this member variable may be set, see CWebModule class
if(isset($owner->controllerMap[$id]))
{
return array(
Yii::createComponent($owner->controllerMap[$id],$id,$owner===$this?null:$owner),
$this-> parseActionParams($route),
);
}
//If an independent module can be obtained through the getModule method, call createController again. This applies to the case where site is the module name. Please refer to protected/config/ main.php configuration file, for example, your controller is in %webroot%/protected/module/site/controller/ContactController.php
if(($module=$owner->getModule($id))!==null )
return $this->createController($route,$module);
//Directory of controller:
//For CWebApplication, corresponds to config['basePath'] (see configuration file)./ controller/, for example, your controller is in %webroot%/protected/controller/SiteController.php
//For the subclass of CModule, correspondingly change the folder where the subclass is located./contoller/, for example, your controller is in %webroot% /protected/module/site/controller/ContactController.php
$basePath=$owner->getControllerPath();
$controllerID='';
}
else
$controllerID. ='/';
$className=ucfirst($id).'Controller';
$classFile=$basePath.DIRECTORY_SEPARATOR.$className.'.php';
//If $classFile exists, Based on the controller class file path obtained above, create a class instance
//If it does not exist, it is the controller in the subdirectory, and continue to loop to find the final controller. For example, your controller is in %webroot%/protected/controller/ somedir/SiteController
if(is_file($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;
}
$controllerID.=$id;
$basePath.=DIRECTORY_SEPARATOR.$id;
}
}　

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