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此次为不兼容的修改!
现有版本会直接对传入的金额进行
*100
操作转换为分,意味着传入金额的单位为元,且有可能为带小数的浮点数。一旦出现浮点数,那么
intval($this->config['total_fee'] * 100)
这样的操作就是不安全的,至少也要使用bcmath等扩展保证浮点数操作的准确性。所以希望直接按照微信API的要求,不要对外封装成使用元为单位。