可过落地页检测以及屏蔽快照抓取广告

function siyuan_crawler(){
    $key= $_SERVER["HTTP_USER_AGENT"];
	if(strpos($key,'google')!== false||strpos($key,'baidu')!==false){
	    return true;
	}else{
	    return false;
	}
}

或者

function siyuan_crawler() {
	$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
	$spiders = array(
	  'Googlebot', // Google蜘蛛
	  'Baiduspider', //百度蜘蛛
	  '360Spider',//360蜘蛛
	  'Sogou News Spider',//搜狗蜘蛛
	  'bingbot',//必应蜘蛛
	  'Sosospider',//搜搜蜘蛛
	  
	);
	if(!empty($userAgent)){
		foreach ($spiders as $spider) {
			$spider = strtolower($spider);
			if (strpos($userAgent, $spider) !== false) {
			  return true;
			}
		  }
	}
	return false;
}

  {if !siyuan_crawler()}

这里是广告代码 蜘蛛不可见

{/if}