fatal error function name must be a string in php

In this below PHP programming I came across the following error

<?php
$user_ip = $_SERVER('REMOTE_ADDR');
echo $user_ip;
?>

it gives the error output in browser as

"fatal error function name must be a string on line 2"

so after checking that code I used ('REMOTE_ADDR') instead of ['REMOTE_ADDR']

so this could be the error free coding

<?php
$user_ip = $_SERVER ['REMOTE_ADDR'];
echo $user_ip;
?>

o/p

127.0.0.1

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