function getImage($url,$save_dir='Public',$filename='',$type=0){
    if(trim($url)==''){
        return array('file_name'=>'','save_path'=>'','error'=>1);
    }
    if(trim($save_dir)==''){
        $save_dir='./';
    }
    if(trim($filename)==''){//保存文件名
        $ext=strrchr($url,'.');
        if($ext!='.gif'&&$ext!='.jpg'&&$ext!='.jpeg'){
            return array('file_name'=>'','save_path'=>'','error'=>3);
        }
        $filename=time().$ext;
    }
    if(0!==strrpos($save_dir,'/')){
        $save_dir.='/';
    }
    //創建保存目錄
    if(!file_exists($save_dir)&&!mkdir($save_dir,0777,true)){
        return array('file_name'=>'','save_path'=>'','error'=>5);
    }
    //獲取遠程文件所采用的方法
    if($type){
        $ch=curl_init();
        $timeout=5;
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
        curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
        $img=curl_exec($ch);
        curl_close($ch);
    }else{
        ob_start();
        readfile($url);
        $img=ob_get_contents();
        ob_end_clean();
    }
    //$size=strlen($img);
    //文件大小
    $fp2=@fopen($save_dir.$filename,'a');
    fwrite($fp2,$img);
    fclose($fp2);
    unset($img,$url);
    return array('file_name'=>$filename,'save_path'=>$save_dir.$filename,'error'=>0);
}