PHP 根据IP地址控制访问的代码

<?php 
$IP = $_SERVER['REMOTE_ADDR']; 
$from = strcmp($IP,'192.168.0.0'); 
$to = strcmp($IP,'192.168.0.255'); 
if (!($from >= 0 && $to <= 0)) 
echo "Access Denied"; 
else 
echo "Homepage"; 
?> 
 
从流程上讲，这段代码首先捕获访客 IP 地址，然后判断该 IP 地址是否符合访问条件。符合则正常

<?php 
if (!($from >= 0 && $to <= 0)) 
echo "Access Denied"; 
else 
include('homepage.html')"; 
?> 
 
当然，也可以按判断结果跳转至不同页面。跳转代码如下： 
 代码如下:

<?php 
if (!($from >= 0 && $to <= 0)) 
header('Location: //www.gxlcms.com/404.html'); 
else 
header('Location: //www.gxlcms.com/index.html'); 
?>