Log Service SDK for PHP，used to set/get log data to Aliyun Log Service(www.aliyun.com/product/sls).
- Request-Request style Restful API interface
- Use Protocol buffer to send data
- Data can be compressed when sending to server
- Aliyun_Log_Exception will be thrown if any error happen
- Introduce simple logger for submit log easily with different levels
- Create local log cache to submit several logs in single http post.