* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CApplication is the base class for all application classes.
*
* An application serves as the global context that the user request
* is being processed. It manages a set of application components that
* provide specific functionalities to the whole application.
*
* The core application components provided by CApplication are the following:
*
* - {@link getErrorHandler errorHandler}: handles PHP errors and
* uncaught exceptions. This application component is dynamically loaded when needed.
* - {@link getSecurityManager securityManager}: provides security-related
* services, such as hashing, encryption. This application component is dynamically
* loaded when needed.
* - {@link getStatePersister statePersister}: provides global state
* persistence method. This application component is dynamically loaded when needed.
* - {@link getCache cache}: provides caching feature. This application component is
* disabled by default.
* - {@link getMessages messages}: provides the message source for translating
* application messages. This application component is dynamically loaded when needed.
* - {@link getCoreMessages coreMessages}: provides the message source for translating
* Yii framework messages. This application component is dynamically loaded when needed.
* - {@link getUrlManager urlManager}: provides URL construction as well as parsing functionality.
* This application component is dynamically loaded when needed.
* - {@link getRequest request}: represents the current HTTP request by encapsulating
* the $_SERVER variable and managing cookies sent from and sent to the user.
* This application component is dynamically loaded when needed.
* - {@link getFormat format}: provides a set of commonly used data formatting methods.
* This application component is dynamically loaded when needed.
*
*
* CApplication will undergo the following lifecycles when processing a user request:
*
* - load application configuration;
* - set up class autoloader and error handling;
* - load static application components;
* - {@link onBeginRequest}: preprocess the user request;
* - {@link processRequest}: process the user request;
* - {@link onEndRequest}: postprocess the user request;
*
*
* Starting from lifecycle 3, if a PHP error or an uncaught exception occurs,
* the application will switch to its error handling logic and jump to step 6 afterwards.
*
* @property string $id The unique identifier for the application.
* @property string $basePath The root directory of the application. Defaults to 'protected'.
* @property string $runtimePath The directory that stores runtime files. Defaults to 'protected/runtime'.
* @property string $extensionPath The directory that contains all extensions. Defaults to the 'extensions' directory under 'protected'.
* @property string $language The language that the user is using and the application should be targeted to.
* Defaults to the {@link sourceLanguage source language}.
* @property string $timeZone The time zone used by this application.
* @property CLocale $locale The locale instance.
* @property string $localeDataPath The directory that contains the locale data. It defaults to 'framework/i18n/data'.
* @property CNumberFormatter $numberFormatter The locale-dependent number formatter.
* The current {@link getLocale application locale} will be used.
* @property CDateFormatter $dateFormatter The locale-dependent date formatter.
* The current {@link getLocale application locale} will be used.
* @property CDbConnection $db The database connection.
* @property CErrorHandler $errorHandler The error handler application component.
* @property CSecurityManager $securityManager The security manager application component.
* @property CStatePersister $statePersister The state persister application component.
* @property CCache $cache The cache application component. Null if the component is not enabled.
* @property CPhpMessageSource $coreMessages The core message translations.
* @property CMessageSource $messages The application message translations.
* @property CHttpRequest $request The request component.
* @property CUrlManager $urlManager The URL manager component.
* @property CController $controller The currently active controller. Null is returned in this base class.
* @property string $baseUrl The relative URL for the application.
* @property string $homeUrl The homepage URL.
*
* @author Qiang Xue
* @package system.base
* @since 1.0
*/
abstract class CApplication extends CModule
{
/**
* @var string the application name. Defaults to 'My Application'.
*/
public $name='My Application';
/**
* @var string the charset currently used for the application. Defaults to 'UTF-8'.
*/
public $charset='UTF-8';
/**
* @var string the language that the application is written in. This mainly refers to
* the language that the messages and view files are in. Defaults to 'en_us' (US English).
*/
public $sourceLanguage='en_us';
private $_id;
private $_basePath;
private $_runtimePath;
private $_extensionPath;
private $_globalState;
private $_stateChanged;
private $_ended=false;
private $_language;
private $_homeUrl;
/**
* Processes the request.
* This is the place where the actual request processing work is done.
* Derived classes should override this method.
*/
abstract public function processRequest();
/**
* Constructor.
* @param mixed $config application configuration.
* If a string, it is treated as the path of the file that contains the configuration;
* If an array, it is the actual configuration information.
* Please make sure you specify the {@link getBasePath basePath} property in the configuration,
* which should point to the directory containing all application logic, template and data.
* If not, the directory will be defaulted to 'protected'.
*/
public function __construct($config=null)
{
Yii::setApplication($this);
// set basePath at early as possible to avoid trouble
if(is_string($config))
$config=require($config);
if(isset($config['basePath']))
{
$this->setBasePath($config['basePath']);
unset($config['basePath']);
}
else
$this->setBasePath('protected');
Yii::setPathOfAlias('application',$this->getBasePath());
Yii::setPathOfAlias('webroot',dirname($_SERVER['SCRIPT_FILENAME']));
Yii::setPathOfAlias('ext',$this->getBasePath().DIRECTORY_SEPARATOR.'extensions');
$this->preinit();
$this->initSystemHandlers();
$this->registerCoreComponents();
$this->configure($config);
$this->attachBehaviors($this->behaviors);
$this->preloadComponents();
$this->init();
}
/**
* Runs the application.
* This method loads static application components. Derived classes usually overrides this
* method to do more application-specific tasks.
* Remember to call the parent implementation so that static application components are loaded.
*/
public function run()
{
if($this->hasEventHandler('onBeginRequest')){
$this->onBeginRequest(new CEvent($this));
}
register_shutdown_function(array($this,'end'),0,false);
$this->processRequest();
if($this->hasEventHandler('onEndRequest'))
$this->onEndRequest(new CEvent($this));
}
/**
* Terminates the application.
* This method replaces PHP's exit() function by calling
* {@link onEndRequest} before exiting.
* @param integer $status exit status (value 0 means normal exit while other values mean abnormal exit).
* @param boolean $exit whether to exit the current request. This parameter has been available since version 1.1.5.
* It defaults to true, meaning the PHP's exit() function will be called at the end of this method.
*/
public function end($status=0,$exit=true)
{
if($this->hasEventHandler('onEndRequest'))
$this->onEndRequest(new CEvent($this));
if($exit)
exit($status);
}
/**
* Raised right BEFORE the application processes the request.
* @param CEvent $event the event parameter
*/
public function onBeginRequest($event)
{
$this->raiseEvent('onBeginRequest',$event);
}
/**
* Raised right AFTER the application processes the request.
* @param CEvent $event the event parameter
*/
public function onEndRequest($event)
{
if(!$this->_ended)
{
$this->_ended=true;
$this->raiseEvent('onEndRequest',$event);
}
}
/**
* Returns the unique identifier for the application.
* @return string the unique identifier for the application.
*/
public function getId()
{
if($this->_id!==null)
return $this->_id;
else
return $this->_id=sprintf('%x',crc32($this->getBasePath().$this->name));
}
/**
* Sets the unique identifier for the application.
* @param string $id the unique identifier for the application.
*/
public function setId($id)
{
$this->_id=$id;
}
/**
* Returns the root path of the application.
* @return string the root directory of the application. Defaults to 'protected'.
*/
public function getBasePath()
{
return $this->_basePath;
}
/**
* Sets the root directory of the application.
* This method can only be invoked at the begin of the constructor.
* @param string $path the root directory of the application.
* @throws CException if the directory does not exist.
*/
public function setBasePath($path)
{
if(($this->_basePath=realpath($path))===false || !is_dir($this->_basePath))
throw new CException(Yii::t('yii','Application base path "{path}" is not a valid directory.',
array('{path}'=>$path)));
}
/**
* Returns the directory that stores runtime files.
* @return string the directory that stores runtime files. Defaults to 'protected/runtime'.
*/
public function getRuntimePath()
{
if($this->_runtimePath!==null)
return $this->_runtimePath;
else
{
$this->setRuntimePath($this->getBasePath().DIRECTORY_SEPARATOR.'runtime');
return $this->_runtimePath;
}
}
/**
* Sets the directory that stores runtime files.
* @param string $path the directory that stores runtime files.
* @throws CException if the directory does not exist or is not writable
*/
public function setRuntimePath($path)
{
if(($runtimePath=realpath($path))===false || !is_dir($runtimePath) || !is_writable($runtimePath))
throw new CException(Yii::t('yii','Application runtime path "{path}" is not valid. Please make sure it is a directory writable by the Web server process.',
array('{path}'=>$path)));
$this->_runtimePath=$runtimePath;
}
/**
* Returns the root directory that holds all third-party extensions.
* @return string the directory that contains all extensions. Defaults to the 'extensions' directory under 'protected'.
*/
public function getExtensionPath()
{
return Yii::getPathOfAlias('ext');
}
/**
* Sets the root directory that holds all third-party extensions.
* @param string $path the directory that contains all third-party extensions.
*/
public function setExtensionPath($path)
{
if(($extensionPath=realpath($path))===false || !is_dir($extensionPath))
throw new CException(Yii::t('yii','Extension path "{path}" does not exist.',
array('{path}'=>$path)));
Yii::setPathOfAlias('ext',$extensionPath);
}
/**
* Returns the language that the user is using and the application should be targeted to.
* @return string the language that the user is using and the application should be targeted to.
* Defaults to the {@link sourceLanguage source language}.
*/
public function getLanguage()
{
return $this->_language===null ? $this->sourceLanguage : $this->_language;
}
/**
* Specifies which language the application is targeted to.
*
* This is the language that the application displays to end users.
* If set null, it uses the {@link sourceLanguage source language}.
*
* Unless your application needs to support multiple languages, you should always
* set this language to null to maximize the application's performance.
* @param string $language the user language (e.g. 'en_US', 'zh_CN').
* If it is null, the {@link sourceLanguage} will be used.
*/
public function setLanguage($language)
{
$this->_language=$language;
}
/**
* Returns the time zone used by this application.
* This is a simple wrapper of PHP function date_default_timezone_get().
* @return string the time zone used by this application.
* @see http://php.net/manual/en/function.date-default-timezone-get.php
*/
public function getTimeZone()
{
return date_default_timezone_get();
}
/**
* Sets the time zone used by this application.
* This is a simple wrapper of PHP function date_default_timezone_set().
* @param string $value the time zone used by this application.
* @see http://php.net/manual/en/function.date-default-timezone-set.php
*/
public function setTimeZone($value)
{
date_default_timezone_set($value);
}
/**
* Returns the localized version of a specified file.
*
* The searching is based on the specified language code. In particular,
* a file with the same name will be looked for under the subdirectory
* named as the locale ID. For example, given the file "path/to/view.php"
* and locale ID "zh_cn", the localized file will be looked for as
* "path/to/zh_cn/view.php". If the file is not found, the original file
* will be returned.
*
* For consistency, it is recommended that the locale ID is given
* in lower case and in the format of LanguageID_RegionID (e.g. "en_us").
*
* @param string $srcFile the original file
* @param string $srcLanguage the language that the original file is in. If null, the application {@link sourceLanguage source language} is used.
* @param string $language the desired language that the file should be localized to. If null, the {@link getLanguage application language} will be used.
* @return string the matching localized file. The original file is returned if no localized version is found
* or if source language is the same as the desired language.
*/
public function findLocalizedFile($srcFile,$srcLanguage=null,$language=null)
{
if($srcLanguage===null)
$srcLanguage=$this->sourceLanguage;
if($language===null)
$language=$this->getLanguage();
if($language===$srcLanguage)
return $srcFile;
$desiredFile=dirname($srcFile).DIRECTORY_SEPARATOR.$language.DIRECTORY_SEPARATOR.basename($srcFile);
return is_file($desiredFile) ? $desiredFile : $srcFile;
}
/**
* Returns the locale instance.
* @param string $localeID the locale ID (e.g. en_US). If null, the {@link getLanguage application language ID} will be used.
* @return CLocale the locale instance
*/
public function getLocale($localeID=null)
{
return CLocale::getInstance($localeID===null?$this->getLanguage():$localeID);
}
/**
* Returns the directory that contains the locale data.
* @return string the directory that contains the locale data. It defaults to 'framework/i18n/data'.
* @since 1.1.0
*/
public function getLocaleDataPath()
{
return CLocale::$dataPath===null ? Yii::getPathOfAlias('system.i18n.data') : CLocale::$dataPath;
}
/**
* Sets the directory that contains the locale data.
* @param string $value the directory that contains the locale data.
* @since 1.1.0
*/
public function setLocaleDataPath($value)
{
CLocale::$dataPath=$value;
}
/**
* @return CNumberFormatter the locale-dependent number formatter.
* The current {@link getLocale application locale} will be used.
*/
public function getNumberFormatter()
{
return $this->getLocale()->getNumberFormatter();
}
/**
* Returns the locale-dependent date formatter.
* @return CDateFormatter the locale-dependent date formatter.
* The current {@link getLocale application locale} will be used.
*/
public function getDateFormatter()
{
return $this->getLocale()->getDateFormatter();
}
/**
* Returns the database connection component.
* @return CDbConnection the database connection
*/
public function getDb()
{
return $this->getComponent('db');
}
/**
* Returns the error handler component.
* @return CErrorHandler the error handler application component.
*/
public function getErrorHandler()
{
return $this->getComponent('errorHandler');
}
/**
* Returns the security manager component.
* @return CSecurityManager the security manager application component.
*/
public function getSecurityManager()
{
return $this->getComponent('securityManager');
}
/**
* Returns the state persister component.
* @return CStatePersister the state persister application component.
*/
public function getStatePersister()
{
return $this->getComponent('statePersister');
}
/**
* Returns the cache component.
* @return CCache the cache application component. Null if the component is not enabled.
*/
public function getCache()
{
return $this->getComponent('cache');
}
/**
* Returns the core message translations component.
* @return CPhpMessageSource the core message translations
*/
public function getCoreMessages()
{
return $this->getComponent('coreMessages');
}
/**
* Returns the application message translations component.
* @return CMessageSource the application message translations
*/
public function getMessages()
{
return $this->getComponent('messages');
}
/**
* Returns the request component.
* @return CHttpRequest the request component
*/
public function getRequest()
{
return $this->getComponent('request');
}
/**
* Returns the URL manager component.
* @return CUrlManager the URL manager component
*/
public function getUrlManager()
{
return $this->getComponent('urlManager');
}
/**
* @return CController the currently active controller. Null is returned in this base class.
* @since 1.1.8
*/
public function getController()
{
return null;
}
/**
* Creates a relative URL based on the given controller and action information.
* @param string $route the URL route. This should be in the format of 'ControllerID/ActionID'.
* @param array $params additional GET parameters (name=>value). Both the name and value will be URL-encoded.
* @param string $ampersand the token separating name-value pairs in the URL.
* @return string the constructed URL
*/
public function createUrl($route,$params=array(),$ampersand='&')
{
return $this->getUrlManager()->createUrl($route,$params,$ampersand);
}
/**
* Creates an absolute URL based on the given controller and action information.
* @param string $route the URL route. This should be in the format of 'ControllerID/ActionID'.
* @param array $params additional GET parameters (name=>value). Both the name and value will be URL-encoded.
* @param string $schema schema to use (e.g. http, https). If empty, the schema used for the current request will be used.
* @param string $ampersand the token separating name-value pairs in the URL.
* @return string the constructed URL
*/
public function createAbsoluteUrl($route,$params=array(),$schema='',$ampersand='&')
{
$url=$this->createUrl($route,$params,$ampersand);
if(strpos($url,'http')===0)
return $url;
else
return $this->getRequest()->getHostInfo($schema).$url;
}
/**
* Returns the relative URL for the application.
* This is a shortcut method to {@link CHttpRequest::getBaseUrl()}.
* @param boolean $absolute whether to return an absolute URL. Defaults to false, meaning returning a relative one.
* @return string the relative URL for the application
* @see CHttpRequest::getBaseUrl()
*/
public function getBaseUrl($absolute=false)
{
return $this->getRequest()->getBaseUrl($absolute);
}
/**
* @return string the homepage URL
*/
public function getHomeUrl()
{
if($this->_homeUrl===null)
{
if($this->getUrlManager()->showScriptName)
return $this->getRequest()->getScriptUrl();
else
return $this->getRequest()->getBaseUrl().'/';
}
else
return $this->_homeUrl;
}
/**
* @param string $value the homepage URL
*/
public function setHomeUrl($value)
{
$this->_homeUrl=$value;
}
/**
* Returns a global value.
*
* A global value is one that is persistent across users sessions and requests.
* @param string $key the name of the value to be returned
* @param mixed $defaultValue the default value. If the named global value is not found, this will be returned instead.
* @return mixed the named global value
* @see setGlobalState
*/
public function getGlobalState($key,$defaultValue=null)
{
if($this->_globalState===null)
$this->loadGlobalState();
if(isset($this->_globalState[$key]))
return $this->_globalState[$key];
else
return $defaultValue;
}
/**
* Sets a global value.
*
* A global value is one that is persistent across users sessions and requests.
* Make sure that the value is serializable and unserializable.
* @param string $key the name of the value to be saved
* @param mixed $value the global value to be saved. It must be serializable.
* @param mixed $defaultValue the default value. If the named global value is the same as this value, it will be cleared from the current storage.
* @see getGlobalState
*/
public function setGlobalState($key,$value,$defaultValue=null)
{
if($this->_globalState===null)
$this->loadGlobalState();
$changed=$this->_stateChanged;
if($value===$defaultValue)
{
if(isset($this->_globalState[$key]))
{
unset($this->_globalState[$key]);
$this->_stateChanged=true;
}
}
elseif(!isset($this->_globalState[$key]) || $this->_globalState[$key]!==$value)
{
$this->_globalState[$key]=$value;
$this->_stateChanged=true;
}
if($this->_stateChanged!==$changed)
$this->attachEventHandler('onEndRequest',array($this,'saveGlobalState'));
}
/**
* Clears a global value.
*
* The value cleared will no longer be available in this request and the following requests.
* @param string $key the name of the value to be cleared
*/
public function clearGlobalState($key)
{
$this->setGlobalState($key,true,true);
}
/**
* Loads the global state data from persistent storage.
* @see getStatePersister
* @throws CException if the state persister is not available
*/
public function loadGlobalState()
{
$persister=$this->getStatePersister();
if(($this->_globalState=$persister->load())===null)
$this->_globalState=array();
$this->_stateChanged=false;
$this->detachEventHandler('onEndRequest',array($this,'saveGlobalState'));
}
/**
* Saves the global state data into persistent storage.
* @see getStatePersister
* @throws CException if the state persister is not available
*/
public function saveGlobalState()
{
if($this->_stateChanged)
{
$this->_stateChanged=false;
$this->detachEventHandler('onEndRequest',array($this,'saveGlobalState'));
$this->getStatePersister()->save($this->_globalState);
}
}
/**
* Handles uncaught PHP exceptions.
*
* This method is implemented as a PHP exception handler. It requires
* that constant YII_ENABLE_EXCEPTION_HANDLER be defined true.
*
* This method will first raise an {@link onException} event.
* If the exception is not handled by any event handler, it will call
* {@link getErrorHandler errorHandler} to process the exception.
*
* The application will be terminated by this method.
*
* @param Exception $exception exception that is not caught
*/
public function handleException($exception)
{
// disable error capturing to avoid recursive errors
restore_error_handler();
restore_exception_handler();
$category='exception.'.get_class($exception);
if($exception instanceof CHttpException)
$category.='.'.$exception->statusCode;
// php <5.2 doesn't support string conversion auto-magically
$message=$exception->__toString();
if(isset($_SERVER['REQUEST_URI']))
$message.="\nREQUEST_URI=".$_SERVER['REQUEST_URI'];
if(isset($_SERVER['HTTP_REFERER']))
$message.="\nHTTP_REFERER=".$_SERVER['HTTP_REFERER'];
$message.="\n---";
Yii::log($message,CLogger::LEVEL_ERROR,$category);
try
{
$event=new CExceptionEvent($this,$exception);
$this->onException($event);
if(!$event->handled)
{
// try an error handler
if(($handler=$this->getErrorHandler())!==null)
$handler->handle($event);
else
$this->displayException($exception);
}
}
catch(Exception $e)
{
$this->displayException($e);
}
try
{
$this->end(1);
}
catch(Exception $e)
{
// use the most primitive way to log error
$msg = get_class($e).': '.$e->getMessage().' ('.$e->getFile().':'.$e->getLine().")\n";
$msg .= $e->getTraceAsString()."\n";
$msg .= "Previous exception:\n";
$msg .= get_class($exception).': '.$exception->getMessage().' ('.$exception->getFile().':'.$exception->getLine().")\n";
$msg .= $exception->getTraceAsString()."\n";
$msg .= '$_SERVER='.var_export($_SERVER,true);
error_log($msg);
exit(1);
}
}
/**
* Handles PHP execution errors such as warnings, notices.
*
* This method is implemented as a PHP error handler. It requires
* that constant YII_ENABLE_ERROR_HANDLER be defined true.
*
* This method will first raise an {@link onError} event.
* If the error is not handled by any event handler, it will call
* {@link getErrorHandler errorHandler} to process the error.
*
* The application will be terminated by this method.
*
* @param integer $code the level of the error raised
* @param string $message the error message
* @param string $file the filename that the error was raised in
* @param integer $line the line number the error was raised at
*/
public function handleError($code,$message,$file,$line)
{
if($code & error_reporting())
{
// disable error capturing to avoid recursive errors
restore_error_handler();
restore_exception_handler();
$log="$message ($file:$line)\nStack trace:\n";
$trace=debug_backtrace();
// skip the first 3 stacks as they do not tell the error position
if(count($trace)>3)
$trace=array_slice($trace,3);
foreach($trace as $i=>$t)
{
if(!isset($t['file']))
$t['file']='unknown';
if(!isset($t['line']))
$t['line']=0;
if(!isset($t['function']))
$t['function']='unknown';
$log.="#$i {$t['file']}({$t['line']}): ";
if(isset($t['object']) && is_object($t['object']))
$log.=get_class($t['object']).'->';
$log.="{$t['function']}()\n";
}
if(isset($_SERVER['REQUEST_URI']))
$log.='REQUEST_URI='.$_SERVER['REQUEST_URI'];
Yii::log($log,CLogger::LEVEL_ERROR,'php');
try
{
Yii::import('CErrorEvent',true);
$event=new CErrorEvent($this,$code,$message,$file,$line);
$this->onError($event);
if(!$event->handled)
{
// try an error handler
if(($handler=$this->getErrorHandler())!==null)
$handler->handle($event);
else
$this->displayError($code,$message,$file,$line);
}
}
catch(Exception $e)
{
$this->displayException($e);
}
try
{
$this->end(1);
}
catch(Exception $e)
{
// use the most primitive way to log error
$msg = get_class($e).': '.$e->getMessage().' ('.$e->getFile().':'.$e->getLine().")\n";
$msg .= $e->getTraceAsString()."\n";
$msg .= "Previous error:\n";
$msg .= $log."\n";
$msg .= '$_SERVER='.var_export($_SERVER,true);
error_log($msg);
exit(1);
}
}
}
/**
* Raised when an uncaught PHP exception occurs.
*
* An event handler can set the {@link CExceptionEvent::handled handled}
* property of the event parameter to be true to indicate no further error
* handling is needed. Otherwise, the {@link getErrorHandler errorHandler}
* application component will continue processing the error.
*
* @param CExceptionEvent $event event parameter
*/
public function onException($event)
{
$this->raiseEvent('onException',$event);
}
/**
* Raised when a PHP execution error occurs.
*
* An event handler can set the {@link CErrorEvent::handled handled}
* property of the event parameter to be true to indicate no further error
* handling is needed. Otherwise, the {@link getErrorHandler errorHandler}
* application component will continue processing the error.
*
* @param CErrorEvent $event event parameter
*/
public function onError($event)
{
$this->raiseEvent('onError',$event);
}
/**
* Displays the captured PHP error.
* This method displays the error in HTML when there is
* no active error handler.
* @param integer $code error code
* @param string $message error message
* @param string $file error file
* @param string $line error line
*/
public function displayError($code,$message,$file,$line)
{
if(YII_DEBUG)
{
echo "PHP Error [$code]
\n";
echo "$message ($file:$line)
\n";
echo '';
$trace=debug_backtrace();
// skip the first 3 stacks as they do not tell the error position
if(count($trace)>3)
$trace=array_slice($trace,3);
foreach($trace as $i=>$t)
{
if(!isset($t['file']))
$t['file']='unknown';
if(!isset($t['line']))
$t['line']=0;
if(!isset($t['function']))
$t['function']='unknown';
echo "#$i {$t['file']}({$t['line']}): ";
if(isset($t['object']) && is_object($t['object']))
echo get_class($t['object']).'->';
echo "{$t['function']}()\n";
}
echo '';
}
else
{
echo "PHP Error [$code]
\n";
echo "$message
\n";
}
}
/**
* Displays the uncaught PHP exception.
* This method displays the exception in HTML when there is
* no active error handler.
* @param Exception $exception the uncaught exception
*/
public function displayException($exception)
{
if(YII_DEBUG)
{
echo ''.get_class($exception)."
\n";
echo ''.$exception->getMessage().' ('.$exception->getFile().':'.$exception->getLine().')
';
echo ''.$exception->getTraceAsString().'
';
}
else
{
echo ''.get_class($exception)."
\n";
echo ''.$exception->getMessage().'
';
}
}
/**
* Initializes the class autoloader and error handlers.
*/
protected function initSystemHandlers()
{
if(YII_ENABLE_EXCEPTION_HANDLER){
set_exception_handler(array($this,'handleException'));
}
if(YII_ENABLE_ERROR_HANDLER){
set_error_handler(array($this,'handleError'),error_reporting());
}
}
/**
* Registers the core application components.
* @see setComponents
*/
protected function registerCoreComponents()
{
$components=array(
'coreMessages'=>array(
'class'=>'CPhpMessageSource',
'language'=>'en_us',
'basePath'=>YII_PATH.DIRECTORY_SEPARATOR.'messages',
),
'db'=>array(
'class'=>'CDbConnection',
),
'messages'=>array(
'class'=>'CPhpMessageSource',
),
'errorHandler'=>array(
'class'=>'CErrorHandler',
),
'securityManager'=>array(
'class'=>'CSecurityManager',
),
'statePersister'=>array(
'class'=>'CStatePersister',
),
'urlManager'=>array(
'class'=>'CUrlManager',
),
'request'=>array(
'class'=>'CHttpRequest',
),
'format'=>array(
'class'=>'CFormatter',
),
);
$this->setComponents($components);
}
}
可以看出该类是个抽象类，(抽象类不一定有抽象方法，但有抽象方法一定是抽象类)
CApplication 有12个属性，3个是公共属性，9个私有属性
下面就是该类的构造函数：
先调用类Yii的静态方法setApplication($this),
确保只创建一个$app.
接着调用is_string，判断$config是否是字符串。
$config是构造函数传递进来的。在开始index.php里面有
$config = /protected/config/main.php
main.php内容如下：
dirname(__FILE__).DIRECTORY_SEPARATOR.'..',
'name'=>'Yii Blog Demo',
// preloading 'log' component
'preload'=>array('log'),
// autoloading model and component classes
'import'=>array(
'application.models.*',
'application.components.*',
),
'defaultController'=>'post',
// application components
'components'=>array(
'user'=>array(
// enable cookie-based authentication
'allowAutoLogin'=>true,
),
'db'=>array(
'connectionString' => 'sqlite:protected/data/blog.db',
'tablePrefix' => 'tbl_',
),
// uncomment the following to use a MySQL database
/*
'db'=>array(
'connectionString' => 'mysql:host=localhost;dbname=blog',
'emulatePrepare' => true,
'username' => 'root',
'password' => '',
'charset' => 'utf8',
'tablePrefix' => 'tbl_',
),
*/
'errorHandler'=>array(
// use 'site/error' action to display errors
'errorAction'=>'site/error',
),
'urlManager'=>array(
'urlFormat'=>'path',
'rules'=>array(
'post//'=>'post/view',
'posts/'=>'post/index',
'/'=>'/',
),
),
'log'=>array(
'class'=>'CLogRouter',
'routes'=>array(
array(
'class'=>'CFileLogRoute',
'levels'=>'error, warning',
),
// uncomment the following to show log messages on web pages
/*
array(
'class'=>'CWebLogRoute',
),
*/
),
),
),
// application-level parameters that can be accessed
// using Yii::app()->params['paramName']
'params'=>require(dirname(__FILE__).'/params.php'),
); 可以看出其实个数组，呢么$config就是一个数组。
接着判断$config的basePath是否存在，由上可知，basePath存在
呢么$this->setBasePath,设置路径。
这里的$this指的是CWebApplication。看下这个方法：
调用realpath($path)返回规范化的绝对路径名，如果失败，返回false
将结果赋值给$this->_basePath,显然得到的结果不是false.
调用is_dir 判断给定文件名是否是一个目录
相似的函数包括：
is_executable 判断给定文件名是否可执行,如果存在且可执行，返回true
is_file ,判断文件是否是正常文件，如果文件存在且为正常的文件则返回 TRUE。
is_link,判断给定文件名是否为一个符号连接,如果文件存在且为符号链接返回true
is_readable 判断给定文件名是否可读,存在且可读返回true
is_uploaded_file 判断文件是否是通过 HTTP POST 上传的 文件是通过 HTTP POST 上传的则返回 TRUE
is_writable( is_writeable ) 判断给定的文件名是否可写 ,如果存在且可写返回true
返回到构造函数中，将$config['basePath'] 注销掉。
接下来三行，设置路径别名的。
调用Yii的setPathOfAlias方法，第一个参数是application，第二个参数调用$this->getBasePath()方法。
getBasePath方法直接返回刚才设置的basePath变量。
setPathOfAlias方法如下：
/**
* Create a path alias.
* Note, this method neither checks the existence of the path nor normalizes the path.
* @param string $alias alias to the path
* @param string $path the path corresponding to the alias. If this is null, the corresponding
* path alias will be removed.
*/
public static function setPathOfAlias($alias,$path)
{
if(empty($path)){
unset(self::$_aliases[$alias]);
}
else{
self::$_aliases[$alias]=rtrim($path,'\\/');
}
}如果第二个参数是空的，则注销掉$_aliases里面的对应的key.
否则，调用系统函数rtrim,去掉字符串后端的字符\/,将值赋值给$_aliases里面。
回到构造函数里面。
继续设置别名root,全局变量$_SERVER['SCRIPT_FILENAME'],调用系统函数dirname。
这里涉及到超全局变量$_SERVER。
实际上超全局变量总共有9个，除了我们常见的$_GET,$_POST,$_REQUEST外
还包括$GLOBALS,$_SERVER,$_COOKIE,$_SESSION,$_FILES,$ENV
其中$_GET,$_POST,$_REQUEST是和浏览器请求相关的，
$_COOKIE是和cookie本地相关，$_SESSION和服务器session相关，
$_FILES和上传相关，$_SERVER和服务器相关，$ENV和环境相关。$GLOBALS，全局的变量。
返回到构造函数
调用preinit（）方法，该方法为空方法。
调用initSystemHandlers方法，绑定异常处理：
/**
* Initializes the class autoloader and error handlers.
*/
protected function initSystemHandlers()
{
if(YII_ENABLE_EXCEPTION_HANDLER){
set_exception_handler(array($this,'handleException'));
}
if(YII_ENABLE_ERROR_HANDLER){
set_error_handler(array($this,'handleError'),error_reporting());
}
}由于在YiiBase.php文件里面设置了YII_ENABLE_EXCEPTION_HANDLER,和YII_ENABLE_ERROR_HANDLER 这俩个常量，故调用系统函
数set_exception_handler和set_error_handler。
该函数属于错误处理函数：