How to know what current system is?

[Jiang Miao <jiangfriend@xxxxxxxxx>]

Is there any function do that?
when php in Linux it returns linux
in windows it returns windows

I found phpinfo(INFO_GENERAL); output the string System => Linux ubuntu 
2.6.24-19-server. but I have no idea to get that info.

Thanks
Jiang Miao


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