获取IP

function get_server_ip() {
    if (isset($_SERVER)) {
        if($_SERVER['SERVER_ADDR']) {
            $server_ip = $_SERVER['SERVER_ADDR'];
        } else {
            $server_ip = $_SERVER['LOCAL_ADDR'];
        }
    } else {
        $server_ip = getenv('SERVER_ADDR');
    }
    return $server_ip;
}