php实现判断访问来路是否为搜索引擎机器人的方法

private function getRobot(){ if (empty($_SERVER['HTTP_USER_AGENT'])) {  return false; } $searchEngineBot = array(  'googlebot'=>'google',  'mediapartners-google'=>'google',  'baiduspider'=>'baidu',  'msnbot'=>'msn',  'yodaobot'=>'yodao',  'youdaobot'=>'yodao',  'yahoo! slurp'=>'yahoo',  'yahoo! slurp china'=>'yahoo',  'iaskspider'=>'iask',  'sogou web spider'=>'sogou',  'sogou push spider'=>'sogou',  'sosospider'=>'soso',  'spider'=>'other',  'crawler'=>'other', ); $spider = strtolower($_SERVER['HTTP_USER_AGENT']); foreach ($searchEngineBot as $key => $value) {   if (strpos($spider, $key)!== false)  {   return $value;  } } return false;}public function isRobot(){ if($this->getRobot()!==false) {  return true; } return false;}