YII 类库手册

protected function createCsrfCookie()
{
    $cookie=new CHttpCookie($this->csrfTokenName,sha1(uniqid(mt_rand(),true)));
    if(is_array($this->csrfCookie))
    {
        foreach($this->csrfCookie as $name=>$value)
            $cookie->$name=$value;
    }
    return $cookie;
}

protected function decodePathInfo($pathInfo)
{
    $pathInfo = urldecode($pathInfo);

    // is it UTF-8?
    // http://w3.org/International/questions/qa-forms-utf-8.html
    if(preg_match('%^(?:
       [\x09\x0A\x0D\x20-\x7E]            # ASCII
     | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
     | \xE0[\xA0-\xBF][\x80-\xBF]         # excluding overlongs
     | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
     | \xED[\x80-\x9F][\x80-\xBF]         # excluding surrogates
     | \xF0[\x90-\xBF][\x80-\xBF]{2}      # planes 1-3
     | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
     | \xF4[\x80-\x8F][\x80-\xBF]{2}      # plane 16
    )*$%xs', $pathInfo))
    {
        return $pathInfo;
    }
    else
    {
        return utf8_encode($pathInfo);
    }
}

public function getAcceptTypes()
{
    return isset($_SERVER['HTTP_ACCEPT'])?$_SERVER['HTTP_ACCEPT']:null;
}

public function getBaseUrl($absolute=false)
{
    if($this->_baseUrl===null)
        $this->_baseUrl=rtrim(dirname($this->getScriptUrl()),'\\/');
    return $absolute ? $this->getHostInfo() . $this->_baseUrl : $this->_baseUrl;
}

public function getBrowser($userAgent=null)
{
    return get_browser($userAgent,true);
}

public function getCookies()
{
    if($this->_cookies!==null)
        return $this->_cookies;
    else
        return $this->_cookies=new CCookieCollection($this);
}

public function getCsrfToken()
{
    if($this->_csrfToken===null)
    {
        $cookie=$this->getCookies()->itemAt($this->csrfTokenName);
        if(!$cookie || ($this->_csrfToken=$cookie->value)==null)
        {
            $cookie=$this->createCsrfCookie();
            $this->_csrfToken=$cookie->value;
            $this->getCookies()->add($cookie->name,$cookie);
        }
    }

    return $this->_csrfToken;
}

public function getDelete($name,$defaultValue=null)
{
    if($this->_deleteParams===null)
        $this->_deleteParams=$this->getIsDeleteRequest() ? $this->getRestParams() : array();
    return isset($this->_deleteParams[$name]) ? $this->_deleteParams[$name] : $defaultValue;
}

public function getHostInfo($schema='')
{
    if($this->_hostInfo===null)
    {
        if($secure=$this->getIsSecureConnection())
            $http='https';
        else
            $http='http';
        if(isset($_SERVER['HTTP_HOST']))
            $this->_hostInfo=$http.'://'.$_SERVER['HTTP_HOST'];
        else
        {
            $this->_hostInfo=$http.'://'.$_SERVER['SERVER_NAME'];
            $port=$secure ? $this->getSecurePort() : $this->getPort();
            if(($port!==80 && !$secure) || ($port!==443 && $secure))
                $this->_hostInfo.=':'.$port;
        }
    }
    if($schema!=='')
    {
        $secure=$this->getIsSecureConnection();
        if($secure && $schema==='https' || !$secure && $schema==='http')
            return $this->_hostInfo;

        $port=$schema==='https' ? $this->getSecurePort() : $this->getPort();
        if($port!==80 && $schema==='http' || $port!==443 && $schema==='https')
            $port=':'.$port;
        else
            $port='';

        $pos=strpos($this->_hostInfo,':');
        return $schema.substr($this->_hostInfo,$pos,strcspn($this->_hostInfo,':',$pos+1)+1).$port;
    }
    else
        return $this->_hostInfo;
}

public function getIsAjaxRequest()
{
    return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH']==='XMLHttpRequest';
}

public function getIsDeleteRequest()
{
    return isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'DELETE');
}

public function getIsPostRequest()
{
    return isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'POST');
}

public function getIsPutRequest()
{
    return isset($_SERVER['REQUEST_METHOD']) && !strcasecmp($_SERVER['REQUEST_METHOD'],'PUT');
}

public function getIsSecureConnection()
{
    return isset($_SERVER['HTTPS']) && !strcasecmp($_SERVER['HTTPS'],'on');
}

public function getParam($name,$defaultValue=null)
{
    return isset($_GET[$name]) ? $_GET[$name] : (isset($_POST[$name]) ? $_POST[$name] : $defaultValue);
}

public function getPathInfo()
{
    if($this->_pathInfo===null)
    {
        $pathInfo=$this->getRequestUri();

        if(($pos=strpos($pathInfo,'?'))!==false)
           $pathInfo=substr($pathInfo,0,$pos);

        $pathInfo=$this->decodePathInfo($pathInfo);

        $scriptUrl=$this->getScriptUrl();
        $baseUrl=$this->getBaseUrl();
        if(strpos($pathInfo,$scriptUrl)===0)
            $pathInfo=substr($pathInfo,strlen($scriptUrl));
        else if($baseUrl==='' || strpos($pathInfo,$baseUrl)===0)
            $pathInfo=substr($pathInfo,strlen($baseUrl));
        else if(strpos($_SERVER['PHP_SELF'],$scriptUrl)===0)
            $pathInfo=substr($_SERVER['PHP_SELF'],strlen($scriptUrl));
        else
            throw new CException(Yii::t('yii','CHttpRequest is unable to determine the path info of the request.'));

        $this->_pathInfo=trim($pathInfo,'/');
    }
    return $this->_pathInfo;
}

public function getPort()
{
    if($this->_port===null)
        $this->_port=!$this->getIsSecureConnection() && isset($_SERVER['SERVER_PORT']) ? (int)$_SERVER['SERVER_PORT'] : 80;
    return $this->_port;
}

public function getPost($name,$defaultValue=null)
{
    return isset($_POST[$name]) ? $_POST[$name] : $defaultValue;
}

public function getPreferredLanguage()
{
    if($this->_preferredLanguage===null)
    {
        if(isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) && ($n=preg_match_all('/([\w\-_]+)\s*(;\s*q\s*=\s*(\d*\.\d*))?/',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches))>0)
        {
            $languages=array();
            for($i=0;$i<$n;++$i)
                $languages[$matches[1][$i]]=empty($matches[3][$i]) ? 1.0 : floatval($matches[3][$i]);
            arsort($languages);
            foreach($languages as $language=>$pref)
                return $this->_preferredLanguage=CLocale::getCanonicalID($language);
        }
        return $this->_preferredLanguage=false;
    }
    return $this->_preferredLanguage;
}

public function getPut($name,$defaultValue=null)
{
    if($this->_putParams===null)
        $this->_putParams=$this->getIsPutRequest() ? $this->getRestParams() : array();
    return isset($this->_putParams[$name]) ? $this->_putParams[$name] : $defaultValue;
}

public function getQuery($name,$defaultValue=null)
{
    return isset($_GET[$name]) ? $_GET[$name] : $defaultValue;
}

public function getQueryString()
{
    return isset($_SERVER['QUERY_STRING'])?$_SERVER['QUERY_STRING']:'';
}

public function getRequestType()
{
    return strtoupper(isset($_SERVER['REQUEST_METHOD'])?$_SERVER['REQUEST_METHOD']:'GET');
}

public function getRequestUri()
{
    if($this->_requestUri===null)
    {
        if(isset($_SERVER['HTTP_X_REWRITE_URL'])) // IIS
            $this->_requestUri=$_SERVER['HTTP_X_REWRITE_URL'];
        else if(isset($_SERVER['REQUEST_URI']))
        {
            $this->_requestUri=$_SERVER['REQUEST_URI'];
            if(!empty($_SERVER['HTTP_HOST']))
            {
                if(strpos($this->_requestUri,$_SERVER['HTTP_HOST'])!==false)
                    $this->_requestUri=preg_replace('/^\w+:\/\/[^\/]+/','',$this->_requestUri);
            }
            else
                $this->_requestUri=preg_replace('/^(http|https):\/\/[^\/]+/i','',$this->_requestUri);
        }
        else if(isset($_SERVER['ORIG_PATH_INFO']))  // IIS 5.0 CGI
        {
            $this->_requestUri=$_SERVER['ORIG_PATH_INFO'];
            if(!empty($_SERVER['QUERY_STRING']))
                $this->_requestUri.='?'.$_SERVER['QUERY_STRING'];
        }
        else
            throw new CException(Yii::t('yii','CHttpRequest is unable to determine the request URI.'));
    }

    return $this->_requestUri;
}

protected function getRestParams()
{
    $result=array();
    if(function_exists('mb_parse_str'))
        mb_parse_str(file_get_contents('php://input'), $result);
    else
        parse_str(file_get_contents('php://input'), $result);
    return $result;
}

public function getScriptFile()
{
    if($this->_scriptFile!==null)
        return $this->_scriptFile;
    else
        return $this->_scriptFile=realpath($_SERVER['SCRIPT_FILENAME']);
}

public function getScriptUrl()
{
    if($this->_scriptUrl===null)
    {
        $scriptName=basename($_SERVER['SCRIPT_FILENAME']);
        if(basename($_SERVER['SCRIPT_NAME'])===$scriptName)
            $this->_scriptUrl=$_SERVER['SCRIPT_NAME'];
        else if(basename($_SERVER['PHP_SELF'])===$scriptName)
            $this->_scriptUrl=$_SERVER['PHP_SELF'];
        else if(isset($_SERVER['ORIG_SCRIPT_NAME']) && basename($_SERVER['ORIG_SCRIPT_NAME'])===$scriptName)
            $this->_scriptUrl=$_SERVER['ORIG_SCRIPT_NAME'];
        else if(($pos=strpos($_SERVER['PHP_SELF'],'/'.$scriptName))!==false)
            $this->_scriptUrl=substr($_SERVER['SCRIPT_NAME'],0,$pos).'/'.$scriptName;
        else if(isset($_SERVER['DOCUMENT_ROOT']) && strpos($_SERVER['SCRIPT_FILENAME'],$_SERVER['DOCUMENT_ROOT'])===0)
            $this->_scriptUrl=str_replace('\\','/',str_replace($_SERVER['DOCUMENT_ROOT'],'',$_SERVER['SCRIPT_FILENAME']));
        else
            throw new CException(Yii::t('yii','CHttpRequest is unable to determine the entry script URL.'));
    }
    return $this->_scriptUrl;
}

public function getSecurePort()
{
    if($this->_securePort===null)
        $this->_securePort=$this->getIsSecureConnection() && isset($_SERVER['SERVER_PORT']) ? (int)$_SERVER['SERVER_PORT'] : 443;
    return $this->_securePort;
}

public function getServerName()
{
    return $_SERVER['SERVER_NAME'];
}

public function getServerPort()
{
    return $_SERVER['SERVER_PORT'];
}

public function getUrl()
{
    return $this->getRequestUri();
}

public function getUrlReferrer()
{
    return isset($_SERVER['HTTP_referer'])?$_SERVER['HTTP_REFERER']:null;
}

public function getUserAgent()
{
    return isset($_SERVER['HTTP_USER_AGENT'])?$_SERVER['HTTP_USER_AGENT']:null;
}

public function getUserHost()
{
    return isset($_SERVER['REMOTE_HOST'])?$_SERVER['REMOTE_HOST']:null;
}

public function getUserHostAddress()
{
    return isset($_SERVER['REMOTE_ADDR'])?$_SERVER['REMOTE_ADDR']:'127.0.0.1';
}

public function init()
{
    parent::init();
    $this->normalizeRequest();
}

protected function normalizeRequest()
{
    // normalize request
    if(function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc())
    {
        if(isset($_GET))
            $_GET=$this->stripSlashes($_GET);
        if(isset($_POST))
            $_POST=$this->stripSlashes($_POST);
        if(isset($_REQUEST))
            $_REQUEST=$this->stripSlashes($_REQUEST);
        if(isset($_COOKIE))
            $_COOKIE=$this->stripSlashes($_COOKIE);
    }

    if($this->enableCsrfValidation)
        Yii::app()->attachEventHandler('onBeginRequest',array($this,'validateCsrfToken'));
}

public function redirect($url,$terminate=true,$statusCode=302)
{
    if(strpos($url,'/')===0)
        $url=$this->getHostInfo().$url;
    header('Location: '.$url, true, $statusCode);
    if($terminate)
        Yii::app()->end();
}

public function sendFile($fileName,$content,$mimeType=null,$terminate=true)
{
    if($mimeType===null)
    {
        if(($mimeType=CFileHelper::getMimeTypeByExtension($fileName))===null)
            $mimeType='text/plain';
    }
    header('Pragma: public');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header("Content-type: $mimeType");
    if(ob_get_length()===false)
        header('Content-Length: '.(function_exists('mb_strlen') ? mb_strlen($content,'8bit') : strlen($content)));
    header("Content-Disposition: attachment; filename=\"$fileName\"");
    header('Content-Transfer-Encoding: binary');

    if($terminate)
    {
        // clean up the application first because the file downloading could take long time
        // which may cause timeout of some resources (such as DB connection)
        Yii::app()->end(0,false);
        echo $content;
        exit(0);
    }
    else
        echo $content;
}

public function setBaseUrl($value)
{
    $this->_baseUrl=$value;
}

public function setHostInfo($value)
{
    $this->_hostInfo=rtrim($value,'/');
}

public function setPort($value)
{
    $this->_port=(int)$value;
    $this->_hostInfo=null;
}

public function setScriptUrl($value)
{
    $this->_scriptUrl='/'.trim($value,'/');
}

public function setSecurePort($value)
{
    $this->_securePort=(int)$value;
    $this->_hostInfo=null;
}

public function stripSlashes(&$data)
{
    return is_array($data)?array_map(array($this,'stripSlashes'),$data):stripslashes($data);
}

public function validateCsrfToken($event)
{
    if($this->getIsPostRequest())
    {
        // only validate POST requests
        $cookies=$this->getCookies();
        if($cookies->contains($this->csrfTokenName) && isset($_POST[$this->csrfTokenName]))
        {
            $tokenFromCookie=$cookies->itemAt($this->csrfTokenName)->value;
            $tokenFromPost=$_POST[$this->csrfTokenName];
            $valid=$tokenFromCookie===$tokenFromPost;
        }
        else
            $valid=false;
        if(!$valid)
            throw new CHttpException(400,Yii::t('yii','The CSRF token could not be verified.'));
    }
}

public function xSendFile($filePath, $options=array())
{
    if(!isset($options['forceDownload']) || $options['forceDownload'])
        $disposition='attachment';
    else
        $disposition='inline';

    if(!isset($options['saveName']))
        $options['saveName']=basename($filePath);

    if(!isset($options['mimeType']))
    {
        if(($options['mimeType']=CFileHelper::getMimeTypeByExtension($filePath))===null)
            $options['mimeType']='text/plain';
    }

    if(!isset($options['xHeader']))
        $options['xHeader']='X-Sendfile';

    if($options['mimeType'] !== null)
        header('Content-type: '.$options['mimeType']);
    header('Content-Disposition: '.$disposition.'; filename="'.$options['saveName'].'"');
    if(isset($options['addHeaders']))
    {
        foreach($options['addHeaders'] as $header=>$value)
            header($header.': '.$value);
    }
    header(trim($options['xHeader']).': '.$filePath);

    if(!isset($options['terminate']) || $options['terminate'])
        Yii::app()->end();
}