七牛抓取远程图片的拆解步骤

 /**
    * 查看七牛url是否存在
    * @param string $url
    */
   function url_exists($url) {
     require_once(COMMON_PATH."qiniu/rs.php");
     require_once(COMMON_PATH."qiniu/http.php");
     $parts=parse_url($url);
     $bucket ；//桶
     $key=substr($parts['path'], );//七牛文件名
    //密钥
     $accessKey ; 
     $secretKey ;
     Qiniu_SetKeys($accessKey, $secretKey);
     $client = new Qiniu_MacHttpClient(null);
     list($ret, $err) = Qiniu_RS_Stat($client, $bucket, $key);//查看单个文件信息
     if ($err !== null) {
       return false;
     } else {
       return true;
     }
   }

 /**
    * 移动单个头像到七牛
    * @param string $remotePath 远程文件在服务器上的物理地址
    * @param string $qiniuPath 七牛文件地址
    */
   function oneFetch($remotePath,$qiniuPath){
     if(!$this->url_exists($qiniuPath) && file_exists($remotePath)){
       require_once(COMMON_PATH."qiniu/rs.php");
       require_once(COMMON_PATH."qiniu/http.php");
       require_once(COMMON_PATH."qiniu/conf.php");
       $client = new Qiniu_MacHttpClient(NULL);
       /*$accessUrl 远程文件访问地址
       *$bucket桶
       *$key 存储在七牛的文件名
       */
       $ret = Qiniu_RS_Fetch($client,$accessUrl, $bucket, $key);
       if($ret != NULL)
       {
         $errlog = 'fail.log';//写错误日志
         file_put_contents($errlog,  "{$key}\n", FILE_APPEND);
       }
       else
       {
         var_dump($ret);
       }
     }else{
       var_dump('已有头像');
     }
   }

function t(){
    header("Content-type: text/html; charset=utf-8");
    set_time_limit(0);
    $start = intval($_GET['num']);//开始位置
    $str = '';
    /*从数据库查询记录*/
    $link = mysql_connect("localhost", "root", "root") or die("error");
    $db_selected = mysql_select_db("test", $link);
    mysql_query ("SET NAMES UTF8");
    $limit = 10;//每次查询数
     $sql = "SELECT * FROM test order by id desc limit {$start},{$limit}"; 
     $result = mysql_query($sql) or die(mysql_error());
    if(mysql_num_rows($result))
    {
      while($row=mysql_fetch_assoc($result)){
          oneFetch($row['remotePath'], $row['qiniuPath']);
      }  
      $start += 10;
      $url = "/t?num={$start}";
      $str = '已经更新'.$start.'条
';
      $str .= '';//更新$limit条，跳转防止脚本无响应
    }
    else
    {
      echo '结束';
    } 
    echo $str;
    ob_flush();
    flush();
    sleep(2);
    unset($sql,$result,$row);
  }