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I added the ##main## definition declaration to the example above, so it will work out of the box.

You probably want wrap it in ##$this->get_user()## condition so it won't be cached.
%%(php)
<?php

if ($this->get_user())
{
	$dot		= strripos($ip, '.');
	$tpl->ip	= substr($ip, 0, $dot) . '.*';
}
%%
Or disable the page cache for guests, which is a rather less good option, it is used primarily for Captcha and form tokens.
%%(php)
<?php

// disable server cache for page
$this->http->no_cache(false);
%%

The ##get_user_ip()## function itself already contains a simple anonymize feature if the config setting ##anonymize_ip## is enabled.
%%(php)
<?php

function get_user_ip()
{
	if ($this->db->anonymize_ip)
	{
		return '0.0.0.0';
	}
	else
	{
		return $this->http->ip;
	}
}
%%