php判断当前访问者是否是爬虫的方法，方法如下：

//判断获取数据的是不是爬虫|机器人
function is_spider() {
    $ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "";
    if (preg_match('#(spider|mj12bot|dotbot|bingbot|googlebot|slurp|SemrushBot|AhrefsBot)#i', $ua)){
        return true;
    }

    return false;
}