如何用PHP实现Ping命令？

如何用PHP实现如下Ping命令啊～在CMD下输入ping 97.74.0.31
并返回：

C:\Documents and Settings\Administrator>ping 97.74.0.31

Pinging 97.74.0.31 with 32 bytes of data:

Reply from 97.74.0.31: bytes=32 time=477ms TTL=44
Reply from 97.74.0.31: bytes=32 time=771ms TTL=44
Reply from 97.74.0.31: bytes=32 time=817ms TTL=44
Reply from 97.74.0.31: bytes=32 time=811ms TTL=44

Ping statistics for 97.74.0.31:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 477ms, Maximum = 817ms, Average = 719ms


网上有个类似的网站：http://www.just-ping.com/
能够输入IP或域名和输出结果，
请各位帮忙～～这个是如何实现的，谢谢了

~~难道没有人会吗？？

PEAR里有个Net_Ping，楼主可以试试看

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