在七牛回調的中，是否有返迴文件大小屬性。屬性是什麼

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上傳策略的callbackBody欄位設定fsize這個魔法變數即可：

http://developer.qiniu.com/docs/v6/api/overview/up/response/vars.html#magicvar

php的話就是產生token的地方

 $bucket = Config::BUCKET_NAME;    $accessKey = Config::ACCESS_KEY;    $secretKey = Config::SECRET_KEY;    $auth = new Auth($accessKey, $secretKey);    $policy = array(      'callbackUrl' => 'http://172.30.251.210/callback.php',      'callbackBody' => '{"fname":"$(fname)", "fsize":"$(fsize)", "fkey":"$(key)", "desc":"$(x:desc)", "uid":' . $uid . '}'      );    $upToken = $auth->uploadToken($bucket, null, 3600, $policy);    header('Access-Control-Allow-Origin:*');    echo $upToken;

