获取客户端IP

 

/**
     * 获取客户端IP
     * @static
     * @return string
     */
    public static function getIP()
    {
        if (getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
            $ip = getenv('HTTP_CLIENT_IP');
        } elseif (getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
            $ip = getenv('HTTP_X_FORWARDED_FOR');
        } elseif (getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
            $ip = getenv('REMOTE_ADDR');
        } elseif (
            isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')
        ) {
            $ip = $_SERVER['REMOTE_ADDR'];
        } else {
            $ip = 'unknown';
        }
        return $ip;
    }