Get user ip and put to file

script.php

Hello, dear user :)
<?php
	$date = date("Y-m-d H:i:s");
	$userIp = $_SERVER['REMOTE_ADDR'];
	$lastLineInFile = "[$date] $userIp\r\n";
	$file = fopen("file.txt", "a+");
	fwrite($file, $lastLineInFile);
	fclose($file);