获取客户端IP

function getIP() /*获取客户端IP*/{    if (@$_SERVER["HTTP_X_FORWARDED_FOR"])        $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];    else if (@$_SERVER["HTTP_CLIENT_IP"])        $ip = $_SERVER["HTTP_CLIENT_IP"];    else if (@$_SERVER["REMOTE_ADDR"])        $ip = $_SERVER["REMOTE_ADDR"];    else if (@getenv("HTTP_X_FORWARDED_FOR"))        $ip = getenv("HTTP_X_FORWARDED_FOR");    else if (@getenv("HTTP_CLIENT_IP"))        $ip = getenv("HTTP_CLIENT_IP");    else if (@getenv("REMOTE_ADDR"))        $ip = getenv("REMOTE_ADDR");    else        $ip = "Unknown";    return $ip;}