CURL缓存远程文件类

expires=$expires;
        $this->timeOut=$timeOut;
        $this->cacheEna=$cacheEna;
        $this->debug=$debug;
    }

    /**
     * 检测并创建目录
     * @return bool
     */
    public function mkdirs(){
        if(is_dir($this->path)){
            return true;
        }else{
            return mkdir($this->path, 777, true);
        }
    }

    /**
     * 设置缓存文件相关信息
     * @param $url
     */
    public function setCacheFileInfo($url){
        $this->url=$url;
        $this->path=dirname(__FILE__).'/cache/';
        $this->filename=$this->url?md5($this->url):'null';
    }

    /**
     * 主方法，取得数据
     * @param $url
     * @return bool|string
     */
    public function get($url){
        $this->setCacheFileInfo($url);
        if($this->cacheEna) $this->data=unserialize($this->getCache($url));
        if(!$this->data) $this->data=$this->curlGet($url);
        if($this->data && $this->cacheEna) $this->setCache($url,serialize($this->data));
        return $this->data->contents;
    }

    /**
     * curl GET 请求数据
     * @param $url
     * @return string
     */
    public function curlGet($url){
        if($this->debug && $url=='') echo('请求URL为空，请检查');
        $return=new stdClass();
        $ch = curl_init ();
        curl_setopt($ch, CURLOPT_URL,$url );
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeOut);
        curl_setopt($ch, CURLOPT_HEADER, 0 );
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        $this->curlData=curl_exec($ch);
        $this->curlHeader=curl_getinfo($ch);
        $this->curlError=curl_error($ch);
        $return->header=$this->curlHeader;
        $return->contents=$this->curlData;
        curl_close($ch);
        if((!$this->curlData || $this->curlHeader['http_code'] != '200') && $this->debug ) 
        echo '请求失败，错误信息：'.$this->curlError;
        else return $return;
    }

    /**
     * 取得缓存数据
     * @param $url
     * @return bool|string
     */
    public function getCache($url){
        $this->setCacheFileInfo($url);
        if(file_exists($this->path.$this->filename)){
            if(time() - filemtime($this->path.$this->filename) 
            < $this->expires) $this->cacheData=file_get_contents($this->path.$this->filename);
            else if($this->debug) echo &#39;缓存文件已过期&#39;;
            if($this->cacheData) return $this->cacheData;else if($this->debug) echo &#39;缓存文件内容为空&#39;;
        }else{
            //if($this->debug) echo &#39;缓存文件不存在&#39;;
            return false;
        }
    }

    /**
     * 写入缓存数据
     * @param $url
     * @param $data
     */
    public function setCache($url,$data){
        $this->setCacheFileInfo($url);
        if(!$this->mkdirs() && $this->debug) echo(&#39;创建缓存目录失败:&#39;.$this->path);
        if($data){
            if(!file_put_contents($this->path.$this->filename,$data) && $this->debug){
                echo &#39;写入缓存失败 File:&#39;.$this->path.$this->filename;
            }
        }else{
            if($this->debug) echo &#39;数据为空，不写入缓存&#39;;
        }
    }



}

get('http://www.baidu.com');
header('Content-type:'.$curlCache->data->header['content_type']);
echo $curlCache->data->contents;