php记录访问者IP地址到txt

<?php 
$ip = $_SERVER["REMOTE_ADDR"];
$time=date('Y-m-d H:i:s',time());
$content = "\r\n"."ip:".$ip." time:".$time; 
//定义文件存放的位置 
$compile_dir = "./iplog.txt"; 
//下面就是写入的PHP代码了 
$file = fopen($compile_dir,"a+"); 
fwrite($file,$content); 
fclose($file); 
?>