在PHP中做事的简单方法是什么? [英] What's an easy way of doing powers in PHP?

问题描述

我正试图制作一个脚本来帮助我的数学学习

I'm trying to make to make a script to help me with my maths

等式示例:y=(4*(x*2)^(2x+4))+4*x^2

要使它起作用，我只需要了解一下，只需将(x*2)置于(2x+4)的幂上，然后再将其归入原始等式即可，当然，您只需答案.

For this to work, I just need it to understand that only (x*2) needs to be put to the power of (2x+4), and then to sub that back into the original equation, which of course you can just eval() an answer.

当我知道x值时，我想计算y的值.如果没有权力，这将相对容易.我只是不知道该怎么做.

I want to calculate the values of y, when I know an x value. This WOULD be relatively easy if it weren't for powers. I just can't get my head round how to do them.

我知道您可以使用pow()，但是我正在尝试制作一个脚本来使用 any 等式.因此有点需要了解语法.

I know you can use pow(), but I'm trying to make a script to work with any equation. So it sort of needs to understand the syntax.

任何建议如何解决?

推荐答案

对于用于评估公式的原生PHP沙箱(如Sjoerd的答案所述)，请查看

For a native PHP sandbox for evaluating formulae, which works as Sjoerd's answer describes, take a look at the evalMath class on PHPClasses.

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