public function createLinkstring($array, $sign = true)
{
//除去待签名参数数组中的空值和签名参数
$data = CoreHelper::paraFilter($array);
//对待签名参数数组排序
$data = CoreHelper::argSort($data);
//把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串
$prestr = CoreHelper::createLinkstring($data);
if (!$sign) {
return $prestr;
}
$data['sign'] = urlencode($this->sign($prestr));
$data['sign_type'] = $this->signType;
return CoreHelper::createLinkstring($data);
}