php获取真实ip的方法

php获取真实ip的方法

//获取真实IP
	static function getIp(){
		if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")){
			$ip = getenv("HTTP_CLIENT_IP");
		}else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")){
			$ip = getenv("HTTP_X_FORWARDED_FOR");
		}else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")){
			$ip = getenv("REMOTE_ADDR");
		}else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")){
			$ip = $_SERVER['REMOTE_ADDR'];
		}else{
			return null;
		}
		if(preg_match('/^(192\.168|127\.0|127\.1)\./',$ip)){
			return null;
		}
		return($ip);
	}