Get the client IP address using PHP [duplicate]

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I want to get the client IP address who uses my website. I am using the PHP $_SERVER superglobal:

$_SERVER['REMOTE_ADDR'];

But I see it can not give the correct IP address using this. I get my IP address and see it is different from my IP address and I can also see my IP address in some website like:

http://whatismyipaddress.com/

I paste the IP address which give my PHP function but this website shows no result about this. How does this problem come about and how can I get IP address of the client?

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