## 簽名所需參數
1 .參數名稱：time 數據類型：時間戳，例如 1564969502
2 .參數名稱：rand 整型數據，例如 9282
3 .參數名稱：key 由平臺地宮
4 .參數名稱：secret 秘鑰有平臺提供
## 簽算法：
```
function arithmetic($time,$rand,$key,$secret){
$data['timeStamp'] = $time;
$data['randomStr'] = $rand;
$data['appkey'] = $key;
$data['appsecret'] = $secret;
//按照首字母大小寫順序排序
sort($arr,SORT_STRING);
//拼接成字符串
$str = implode($data);
//進行加密
$signature = sha1($str);
$signature = md5($signature);
$signature = md5($signature);
//轉換成大寫
$signature = strtoupper($signature);
return $signature;
}
```
