定制 stancl/unit-price-calculator 二次开发
按需修改功能、优化性能、对接业务系统，提供一站式技术支持
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Composer 安装命令：
composer require stancl/unit-price-calculator
A library for calculating unit prices
Not versioned, for internal use. But licensed under MIT so feel free to use this code however you see fit.
Written to support PHP 7.3.