YII 类库手册

public function addRules($rules, $append=true)
{
    if ($append)
    {
        foreach($rules as $pattern=>$route)
            $this->_rules[]=$this->createUrlRule($route,$pattern);
    }
    else
    {
        foreach($rules as $pattern=>$route)
            array_unshift($this->_rules, $this->createUrlRule($route,$pattern));
    }
}

public function createPathInfo($params,$equal,$ampersand, $key=null)
{
    $pairs = array();
    foreach($params as $k => $v)
    {
        if ($key!==null)
            $k = $key.'['.$k.']';

        if (is_array($v))
            $pairs[]=$this->createPathInfo($v,$equal,$ampersand, $k);
        else
            $pairs[]=urlencode($k).$equal.urlencode($v);
    }
    return implode($ampersand,$pairs);
}

public function createUrl($route,$params=array(),$ampersand='&')
{
    unset($params[$this->routeVar]);
    foreach($params as $i=>$param)
        if($param===null)
            $params[$i]='';

    if(isset($params['#']))
    {
        $anchor='#'.$params['#'];
        unset($params['#']);
    }
    else
        $anchor='';
    $route=trim($route,'/');
    foreach($this->_rules as $i=>$rule)
    {
        if(is_array($rule))
            $this->_rules[$i]=$rule=Yii::createComponent($rule);
        if(($url=$rule->createUrl($this,$route,$params,$ampersand))!==false)
        {
            if($rule->hasHostInfo)
                return $url==='' ? '/'.$anchor : $url.$anchor;
            else
                return $this->getBaseUrl().'/'.$url.$anchor;
        }
    }
    return $this->createUrlDefault($route,$params,$ampersand).$anchor;
}

protected function createUrlDefault($route,$params,$ampersand)
{
    if($this->getUrlFormat()===self::PATH_FORMAT)
    {
        $url=rtrim($this->getBaseUrl().'/'.$route,'/');
        if($this->appendParams)
        {
            $url=rtrim($url.'/'.$this->createPathInfo($params,'/','/'),'/');
            return $route==='' ? $url : $url.$this->urlSuffix;
        }
        else
        {
            if($route!=='')
                $url.=$this->urlSuffix;
            $query=$this->createPathInfo($params,'=',$ampersand);
            return $query==='' ? $url : $url.'?'.$query;
        }
    }
    else
    {
        $url=$this->getBaseUrl();
        if(!$this->showScriptName)
            $url.='/';
        if($route!=='')
        {
            $url.='?'.$this->routeVar.'='.$route;
            if(($query=$this->createPathInfo($params,'=',$ampersand))!=='')
                $url.=$ampersand.$query;
        }
        else if(($query=$this->createPathInfo($params,'=',$ampersand))!=='')
            $url.='?'.$query;
        return $url;
    }
}

protected function createUrlRule($route,$pattern)
{
    if(is_array($route) && isset($route['class']))
        return $route;
    else
        return new $this->urlRuleClass($route,$pattern);
}

public function getBaseUrl()
{
    if($this->_baseUrl!==null)
        return $this->_baseUrl;
    else
    {
        if($this->showScriptName)
            $this->_baseUrl=Yii::app()->getRequest()->getScriptUrl();
        else
            $this->_baseUrl=Yii::app()->getRequest()->getBaseUrl();
        return $this->_baseUrl;
    }
}

public function getUrlFormat()
{
    return $this->_urlFormat;
}

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

public function parsePathInfo($pathInfo)
{
    if($pathInfo==='')
        return;
    $segs=explode('/',$pathInfo.'/');
    $n=count($segs);
    for($i=0;$i<$n-1;$i+=2)
    {
        $key=$segs[$i];
        if($key==='') continue;
        $value=$segs[$i+1];
        if(($pos=strpos($key,'['))!==false && ($m=preg_match_all('/\[(.*?)\]/',$key,$matches))>0)
        {
            $name=substr($key,0,$pos);
            for($j=$m-1;$j>=0;--$j)
            {
                if($matches[1][$j]==='')
                    $value=array($value);
                else
                    $value=array($matches[1][$j]=>$value);
            }
            if(isset($_GET[$name]) && is_array($_GET[$name]))
                $value=CMap::mergeArray($_GET[$name],$value);
            $_REQUEST[$name]=$_GET[$name]=$value;
        }
        else
            $_REQUEST[$key]=$_GET[$key]=$value;
    }
}

public function parseUrl($request)
{
    if($this->getUrlFormat()===self::PATH_FORMAT)
    {
        $rawPathInfo=$request->getPathInfo();
        $pathInfo=$this->removeUrlSuffix($rawPathInfo,$this->urlSuffix);
        foreach($this->_rules as $i=>$rule)
        {
            if(is_array($rule))
                $this->_rules[$i]=$rule=Yii::createComponent($rule);
            if(($r=$rule->parseUrl($this,$request,$pathInfo,$rawPathInfo))!==false)
                return isset($_GET[$this->routeVar]) ? $_GET[$this->routeVar] : $r;
        }
        if($this->useStrictParsing)
            throw new CHttpException(404,Yii::t('yii','Unable to resolve the request "{route}".',
                array('{route}'=>$pathInfo)));
        else
            return $pathInfo;
    }
    else if(isset($_GET[$this->routeVar]))
        return $_GET[$this->routeVar];
    else if(isset($_POST[$this->routeVar]))
        return $_POST[$this->routeVar];
    else
        return '';
}

protected function processRules()
{
    if(empty($this->rules) || $this->getUrlFormat()===self::GET_FORMAT)
        return;
    if($this->cacheID!==false && ($cache=Yii::app()->getComponent($this->cacheID))!==null)
    {
        $hash=md5(serialize($this->rules));
        if(($data=$cache->get(self::CACHE_KEY))!==false && isset($data[1]) && $data[1]===$hash)
        {
            $this->_rules=$data[0];
            return;
        }
    }
    foreach($this->rules as $pattern=>$route)
        $this->_rules[]=$this->createUrlRule($route,$pattern);
    if(isset($cache))
        $cache->set(self::CACHE_KEY,array($this->_rules,$hash));
}

public function removeUrlSuffix($pathInfo,$urlSuffix)
{
    if($urlSuffix!=='' && substr($pathInfo,-strlen($urlSuffix))===$urlSuffix)
        return substr($pathInfo,0,-strlen($urlSuffix));
    else
        return $pathInfo;
}

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

public function setUrlFormat($value)
{
    if($value===self::PATH_FORMAT || $value===self::GET_FORMAT)
        $this->_urlFormat=$value;
    else
        throw new CException(Yii::t('yii','CUrlManager.UrlFormat must be either "path" or "get".'));
}