$u=strtolower($_SERVER['HTTP_USER_AGENT']);
if(preg_match('/baiduspider|yisouspider|360spider|sogou (web )?spider/',$u)){
    for($i=1;$i<=100;$i++)echo'<li><a href="/core/news.php/'.mt_rand(10000000, 99999999).'.shtml"></a></li>',"\r\n";
}