/**
*  @Explain:  獲取IP地址
*/
function getIP(){
   if ($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]) { 
      $ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]; 
   } 
   elseif ($HTTP_SERVER_VARS["HTTP_CLIENT_IP"]) { 
      $ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"]; 
   }
   elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"
 
]) { 
      $ip = $HTTP_SERVER_VARS["REMOTE_ADDR"]; 
   } 
   elseif (getenv("HTTP_X_FORWARDED_FOR")) { 
      $ip = getenv("HTTP_X_FORWARDED_FOR"); 
   } 
   elseif (getenv("HTTP_CLIENT_IP")) { 
      $ip = getenv("HTTP_CLIENT_IP"); 
   } 
   elseif (getenv("REMOTE_ADDR")) { 
      $ip = getenv("REMOTE_ADDR"
 
); 
   } 
   else { 
      $ip = "Unknown"; 
   }
   return $ip;
}