Get the client's IP address

There are two ways to get the client’s IP address, getenv(“REMOTE_ADDR”) and $_SERVER[‘REMOTE_ADDR’]

If the server space is IIS, use $_SERVER[‘REMOTE_ADDR’]
If the server space is apache, use getenv("REMOTE_ADDR")

Summary:
getenv("REMOTE_ADDR") function can obtain the IP address normally under apache, but in iis, it has no effect at all, and $_SERVER['REMOTE_ADDR '] function can successfully obtain the visitor's IP address in Apache and is also effective under IIS.

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The above introduces how to obtain the client's IP address, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.