PHP most accurate / safe way to get real user IP address in 2017

Question

What is the most accurate way to get user\'s IP address in 2017 via PHP?

I\'ve read a lot of SO questions and answers about it, but most of answers are old and comme

Answer 1

Short answer:

$ip = $_SERVER['REMOTE_ADDR'];

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As of 2019 $_SERVER['REMOTE_ADDR']; is the only reliable way to get users ip address, but it can show erroneous results if behind a proxy server.
All other solutions imply security risks or can be easily faked.