获得客户端真实的IP地址-PHP教程,PHP应用

function getip(){

if (getenv("http_client_ip") && strcasecmp(getenv("http_client_ip"), "unknown"))

$ip = getenv("http_client_ip");

else if (getenv("http_x_forwarded_for") && strcasecmp(getenv("http_x_forwarded_for"), "unknown"))

$ip = getenv("http_x_forwarded_for");

else if (getenv("remote_addr") && strcasecmp(getenv("remote_addr"), "unknown"))

$ip = getenv("remote_addr");

else if (isset($_server[remote_addr]) && $_server[remote_addr] && strcasecmp($_server[remote_addr], "unknown"))

$ip = $_server[remote_addr];

else

$ip = "unknown";

return($ip);

}

即使用户通过代理服务器上网，也能查出他的ip。但是要求代理服务器的类型是transparent类型。如果代理服务器是anonymous或者是high anonymous类型，http_x_forwarded_for也无能为力了。