php之获取ip（网站地址）

 /**
  * 获取当前服务器的IP
  * @return Ambigous <string, unknown>
  */
 function get_client_ip()
 {
  if (isset($_SERVER['REMOTE_ADDR'])) {
   $cip = $_SERVER['REMOTE_ADDR'];
  } elseif (getenv("REMOTE_ADDR")) {
   $cip = getenv("REMOTE_ADDR");
  } elseif (getenv("HTTP_CLIENT_IP")) {
   $cip = getenv("HTTP_CLIENT_IP");
  } else {
   $cip = "127.0.0.1";
  }
  return $cip;
 }