- function getIP() {
- if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
- $realip = $_SERVER['HTTP_X_FORWARDED_FOR'];
- } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
- $realip = $_SERVER['HTTP_CLIENT_IP'];
- } else {
- $realip = $_SERVER['REMOTE_ADDR'];
- }
- return $realip;
- }
这个是网上常见获取ip函数
其中x-forword-fox的值是可以被自定义改写的.
在firefox下通过Moify Headers插件或者用php的fsockopen()函数等方法来改写.
如果你需要将IP写入数据库并打开的错误输出,那么将HTTP_X_FORWARDED_FOR的值改成192.168.0.1′ or 1= 是可能会产生sql注射.
同样$_SERVER[“HTTP_USER_AGENT”],$_SERVER[“HTTP_ACCEPT_LANGUAGE”],$_SERVER[‘HTTP_REFERER’] 等http变量入库时也需做过滤
改进的获取ip函数
- if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
- $OnlineIP = getenv('HTTP_CLIENT_IP');
- } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
- $OnlineIP = getenv('HTTP_X_FORWARDED_FOR');
- } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
- $OnlineIP = getenv('REMOTE_ADDR');
- } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
- $OnlineIP = $_SERVER['REMOTE_ADDR'];
- }
- preg_match("/[\d\.]{7,15}/", $OnlineIP, $match);
- $OnlineIP = $match[0] ? $match[0] : 'unknown';
- unset($match);
参考:
http://www.jb51.net/article/37690.htm
http://zhangxugg-163-com.iteye.com/blog/1663687