langleyfoxall / math_eval

✖️➕➖➗ `math_eval` safely evaluates mathematical expressions

✖️➕➖➗ Math Eval Helper Function

This PHP package provides a math_eval helper function, that allows safe evaluation of mathematical expressions, without the use of the potentially dangerous eval function.

Installation

The math_eval package can be easily installed using Composer. Just run the following command from the root of your project.

composer require "langleyfoxall/math_eval"

If you have never used the Composer dependency manager before, head to the Composer website for more information on how to get started.

Usage

To evaluate a basic mathematical expression, just pass its string representation to the math_eval function.

Here are some basic usage examples:

$two = math_eval('1 + 1');
$three = math_eval('5 - 2');
$ten = math_eval('2 * 5');
$four = math_eval('8 / 2');

It is also possible to pass expression variables. See the examples below.

$ten = math_eval('a + b', ['a' => 7, 'b' => 3]);
$fifteen = math_eval('x * y', ['x' => 3, 'y' => 5]);

Credit

This package makes use of the mossadal/math-parser package.

math_eval's Issues

Example code misses 'require'

The example code misses the mandatory require:
require 'vendor/autoload.php';
The code does not run as written in the example.

Problem with simple calcul

Hi,

I have a problem with a simple calcul :

math_eval("0.37+0.31-0.68"), the result is "0" but the math_eval function return "-1.1102230246252E-16"

Have you an idea of the problem ?

Thanks