实现流程是： 

　　1、判断用户端的浏览器类型

　　2、根据搜索引擎机器人的名称进行判断用户是否蜘蛛人

 

/** * 判断是否为搜索引擎蜘蛛 * * @access  public * @return  string */function is_spider($record = true){    static $spider = NULL;    if ($spider !== NULL)    {        return $spider;    }    if (empty($_SERVER['HTTP_USER_AGENT']))    {        $spider = '';        return '';    }    $searchengine_bot = array(        'googlebot',        'mediapartners-google',        'baiduspider+',        'msnbot',        'yodaobot',        'yahoo! slurp;',        'yahoo! slurp china;',        'iaskspider',        'sogou web spider',        'sogou push spider'    );    $searchengine_name = array(        'GOOGLE',        'GOOGLE ADSENSE',        'BAIDU',        'MSN',        'YODAO',        'YAHOO',        'Yahoo China',        'IASK',        'SOGOU',        'SOGOU'    );    $spider = strtolower($_SERVER['HTTP_USER_AGENT']);    foreach ($searchengine_bot AS $key => $value)    {        if (strpos($spider, $value) !== false)        {            $spider = $searchengine_name[$key];            /*if ($record === true)            {                $GLOBALS['db']->autoReplace($GLOBALS['ecs']->table('searchengine'), array('date' => local_date('Y-m-d'), 'searchengine' => $spider, 'count' => 1), array('count' => 1));            }*/            return $spider;        }    }    $spider = '';    return '';}