包简介

Use the EvalMath when you want to evaluate mathematical expressions from untrusted sources.

README 文档

README

Safely evaluate math expressions.

Description

The EvalMath empowers safe evaluation of mathematical expressions originating from potentially untrusted sources.
It supports built-in and user-defined functions and variables, offering flexibility for complex mathematical operations.

Usage

# Create a base instance (default precision is set to 6 digits after the decimal point)
$em = new EvalMath;

# Create a base instance with the precision parameter set to 2 digits after the decimal point
$em = new EvalMath(2);

# Basic evaluation:
$result = $em->evaluate('2+2');

# Supports: order of operation; parentheses; negation; built-in functions
$result = $em->evaluate('-8(5/2)^2*(1-sqrt(4))-8');

# Create your own variables
$em->evaluate('a = e^(ln(pi))');

# or functions
$em->evaluate('f(x,y) = x^2 + y^2 - 2x*y + 1');

# and then use them
$result = $em->evaluate('3*f(42,a)');

Methods

Method	Description
`$em->evaluate($expression)`	Evaluates the expression and returns the result
`$em->e($expression)`	A synonym for `$m->evaluate($expression)`
`$em->getUserVariables()`	Returns an associative array of all user-defined variables and values
`$em->getUserFunctions()`	Returns an array of all user-defined functions

Credits

This is a heavily refactored version of EvalMath, originally by Daniel Bojdo, which is based on Miles Kaufmann's EvalMath class.

License

This project is licensed under the BSD 3-Clause License. The full text of the license can be found in the LICENSE file.

hinyka/evalmath 适用场景与选型建议

hinyka/evalmath 是一款基于 PHP 开发的 Composer 扩展包，目前已累计 11 次下载、GitHub Stars 达 0，最近一次更新时间为 2023 年 08 月 24 日，在 PHP 生态内属于活跃度较高的组件。

它主要适用于以下技术方向：「math」「expression」「eval」「evaluator」「EvalMath」等业务场景。在实际项目中，围绕这些方向常见需要落地的问题包括：接口对接、性能调优、并发安全、与既有框架（Laravel / ThinkPHP / Yii / Webman 等）的兼容适配，以及生产环境的日志埋点与稳定性保障。

我们在过去多个企业项目中使用过 hinyka/evalmath 或与其功能相近的方案，如果你在选型或落地过程中遇到问题，例如 版本兼容、二次改造、私有化封装、与内部系统对接、生产 BUG 排查，欢迎联系我们协助评估。

围绕 hinyka/evalmath 我们能提供哪些服务？

定制开发 / 二次开发

基于 hinyka/evalmath 在你已有业务上做功能扩展、字段裁剪、UI 适配、与内部账号 / 权限 / 日志系统的深度对接。

BUG 修复 & 性能优化

线上偶发问题、内存泄漏、慢查询、并发异常等排查修复；针对高流量场景做缓存、队列、索引层面的调优。

项目外包 & 长期维护

承接完整的项目从需求 → 设计 → 开发 → 上线 → 长期运维；也可按月提供技术保姆服务。

yvsm@zunyunkeji.com QQ：316430983 微信：yvsm316 西安尊云信息科技 · 专注 PHP / Go / 分布式系统研发

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hinyka/evalmath

包简介

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