You can use one of the following:

<?php
echo 'Your IP is: ' . $_SERVER['REMOTE_ADDR'];
?>

OR

<?php
echo 'Your IP is: ' . getenv('REMOTE_ADDR');
?>

You will probably use the information somewhere so it might be better to set a variable

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

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