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Example code of ibelousov/math-exec

Informations about the package math-exec

MathExec

MathExec is a php library for parsing and evaluating math expressions like this:

Or you could prepare an expression template and then execute it, with specified precision, when needed, by providing needed variables

or like this:

and this also is true:

It utilizes a Pratt parser, and uses ext-bcmath extension to evaluate operations. For example this expression

internally turns into this

it is very nice and convenient to write expressions naturally, without using bcadd, bcdiv, etc.

Installation

Use the package manager composer to install it

Usage

First of all import class Evaluator:

Supported things

(you could set inner precision, like this:

by default it is 40 signs after point )

// Multiplication

// Division

Functions

Also you can add your own functions like this:

Use with cautiousness

Inner representation of numbers

For example if you call this

it evaluates to 1, because inner representation in this case is 0, and when you divide 6/5 you get 1 and not 1.2

For accurate numbers comparison you should set precision properly. In case shown above, you should do this, to properly compare numbers

Converting to native PHP number formats

Other convertions, like this

are unpredictable

To evaluate and then compare numbers with high precision and/or big numbers, you should prefer storing values in strings instead of converting them into float or int.

REPL

You can use REPL to test expression evaluation:

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT

All versions of math-exec with dependencies

PHP Build Version
Package Version
Requires php Version >=7.2
ext-bcmath Version >=7.2
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