PHP对于无符号数，数据较大时，格式化会出现差1或2的情况，替代办法用mysql来计算结果
实例代码如下：

private function getUnsinInt($number)
{
    $sql = "SELECT
CAST(
    ($number & 0xFFFFFFFF) AS UNSIGNED INTEGER
) as uns_int;";
    $res = pdo_fetch($sql);
    return $res[‘uns_int‘];
}

替代PHP格式化成无符号数后精度不对问题