錯誤提示：
user: 'root' host: `localhost' (Got timeout reading communication packets)
MYSQL server has gone away
引起這個原因是不可怕的．原因是更改了系統的斷開時間．
mysql>show gloable variables like "%timeout%";
進行查看
interactive_timeout 的黓認值為28800
wait_timeout 的默認值這：120
根據情況增加吧．
這兩個值是一個全局變量，可以動態增加，如：
mysql> set global interactive_timeout=28800;
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like "interactive_timeout";
+---------------------+-------+
| Variable_name | Value |
+---------------------+-------+
| interactive_timeout | 28800 |
+---------------------+-------+
1 row in set (0.00 sec)
可以導致Got timeout reading communication packets錯誤的原因
https://dev.mysql.com/doc/refman/5.5/en/communication-errors.html
可能導致Got Timeout reading communication packets錯誤的原因有如下幾個：
A client attempts to access a database but has no privileges for it.（沒有權限）
A client uses an incorrect password.(密碼錯誤)
A connection packet does not contain the right information.(連接沒有包含正確信息)
It takes more than connect_timeout seconds to obtain a connect packet. (獲取連接信息起過connect_timeout的時長)
The client program did not call mysql_close() before exiting.(客戶端沒有調用mysql_close()函數)
The client had been sleeping more than wait_timeout or interactive_timeout seconds without issuing any requests to the server. (客戶端的空連接時間過長，超過了wait_timeout和interactive_timeout的時間)
The client program ended abruptly in the middle of a data transfer.(數據傳輸過程中終結)
錯誤排查：
因為我們手機版與pc端的php函數不同步導致的問題，所以仔細檢查一下問題就解決了。
