Why does the same user IP come from different ones?

Question

PHP

Good day!
Please tell me what's the matter.
In my application form, there is a definition of the user's ip and sending it to me by mail along with a message.
Actually code:

<input type="hidden" name="ip" value="<?php echo $_SERVER['REMOTE_ADDR']; ?>" />

Tell me why the same one always comes?
Thanks in advance for the answer of knowledgeable programmers!

Answer 1

Most likely because you have a zoo of web servers that stand one after another.
Get rid of Apache, leave only nginx.

Answer 2

$_SERVER["REMOTE_ADDR"] - this is the remote server IP
Here $_SERVER['HTTP_CLIENT_IP'] try))

Answer 3

Well, you have the codes