Maths

This PHP package provides an object-oriented wrapper for bcmath functionality and other common operations for dealing with numbers.

One aim of this project is to provide a greater degree of accuracy when dealing with floating point numbers.

Installation

To install the package via Composer, run:

composer require elliotjreed/maths

or include the dependency in your composer.json file, for example:

  "require": {
    "php": "^8.1",
    "ext-bcmath": "*",
    "elliotjreed/maths": "^6.1"
  }

Usage

There are two base classes, Number and NumberImmutable.

Both can take any numeric value in the constructor (i.e. a numeric string such as '1.5', an integer such as 150, a float such as 1.33, or a scientific notation string such as '8.431e-05').

The result can be returned as a string, integer, or float.

For an example of the differences between Number and NumberImmutable:

use ElliotJReed\Maths\NumberImmutable;
use ElliotJReed\Maths\Number;

$numberImmutable = new NumberImmutable(10);
$newNumberImmutable = $number->multiply(3);
$numberImmutable->asFloat(); // 10.0
$newNumberImmutable->asFloat(); // 30.0

$number = new Number(15);
$newNumber = $number->multiply(3);
$number->asFloat(); // 45.0
$newNumber->asFloat(); // 45.0

Number

The Number object is mutable.

Examples:

use ElliotJReed\Maths\Number;

$number = new Number('123.5');

$number->multiply(2);
$number->add(3);
$number->divide(10);
$number->subtract(20);

$number->asFloat(); // 25.0
$number->asInteger(); // 25
$number->asString(); // '25'
$number->asString(1); // '25.0'
$number->asString(2); // '25.00'
$number->asString(3); // '25.000'

$number->isEqualTo(25); // true
$number->isLessThan(30); // true
$number->isGreaterThan(20); // true
$number->isGreaterThanOrEqualTo(25); // true
$number->isLessThanOrEqualTo(25); // true
$number->isZero(); // false

use ElliotJReed\Maths\Number;

$number = new Number(123.5);

$number->multiply(2)->add(3)->divide(10)->subtract(20);

$number->asFloat(); // 25.0
$number->asInteger(); // 25
$number->asString(); // '25'

Numbers can be int, float, string, or instances of Number.

use ElliotJReed\Maths\Number;

$number = new Number(123.5);

$number->multiply(new Number(2));
$number->add('3');
$number->divide(10.0);
$number->subtract(20);

$number->asFloat(); // 25.0
$number->asInteger(); // 25
$number->asString(); // '25'

use ElliotJReed\Maths\Number;

$number = new Number(10);
$anotherNumber = new Number($number);

$number->asFloat(); // 10.0
$anotherNumber->asFloat(); // 10.0

$number->add(10)->asFloat(); // 20.0
$anotherNumber->add(5)->asFloat(); // 15.0

use ElliotJReed\Maths\Number;

$number = new Number(1.125);

$number->roundToDecimalPlaces(2);

$number->asFloat(); // 1.13
$number->asInteger(); // 1
$number->asString(); // '1.13'

use ElliotJReed\Maths\Number;

$number = new Number(25);

$number->squareRoot();

$number->asFloat(); // 5.0
$number->asInteger(); // 5
$number->asString(); // '5'

use ElliotJReed\Maths\Number;

$number = new Number(5);

$number->raiseToPower(2);

$number->asFloat(); // 5.0
$number->asInteger(); // 5
$number->asString(); // '5'

use ElliotJReed\Maths\Number;

$number = new Number('25');

$number->increaseByPercentage(10);

$number->asFloat(); // 27.5
$number->asInteger(); // 28
$number->asInteger(PHP_ROUND_HALF_DOWN); // 27
$number->asString(); // '27.5'
$number->asString(2); // '27.50'

use ElliotJReed\Maths\Number;

$number = new Number(5.5);

$number->modulus(2.5);

$number->asFloat(); // 0.5
$number->asInteger(); // 1
$number->asInteger(PHP_ROUND_HALF_DOWN); // 0
$number->asString(); // '0.5'
$number->asString(2); // '0.50'

use ElliotJReed\Maths\Number;

$number = new Number('8.431e-05');

$number->asFloat(); // 0.00008431
$number->asString(); // '0.00008431'

NumberImmutable

The NumberImmutable class is immutable.

Examples:

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable('123.5');

$number = $number->multiply(2);
$number = $number->add(3);
$number = $number->divide(10);
$number = $number->subtract(20);

$number->asFloat(); // 25.0
$number->asInteger(); // 25
$number->asString(); // '25'
$number->asString(1); // '25.0'
$number->asString(2); // '25.00'
$number->asString(3); // '25.000'

$number->isEqualTo(25); // true
$number->isLessThan(30); // true
$number->isGreaterThan(20); // true
$number->isGreaterThanOrEqualTo(25); // true
$number->isLessThanOrEqualTo(25); // true
$number->isZero(); // false

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable(123.5);

$number = $number->multiply(2)->add(3)->divide(10)->subtract(20);

$number->asFloat(); // 25.0
$number->asInteger(); // 25
$number->asString(); // '25'

Numbers can be int, float, string, or instances of Number.

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable(123.5);

$number = $number->multiply(new NumberImmutable(2));
$number = $number->add('3');
$number = $number->divide(10.0);
$number = $number->subtract(20);

$number->asFloat(); // 25.0
$number->asInteger(); // 25
$number->asString(); // '25'

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable(1.125);

$number = $number->roundToDecimalPlaces(2);

$number->asFloat(); // 1.13
$number->asInteger(); // 1
$number->asString(); // '1.13'

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable(25);

$number = $number->squareRoot();

$number->asFloat(); // 5.0
$number->asInteger(); // 5
$number->asString(); // '5'

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable(5);

$number = $number->raiseToPower(2);

$number->asFloat(); // 5.0
$number->asInteger(); // 5
$number->asString(); // '5'

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable('25');

$number = $number->increaseByPercentage(10);

$number->asFloat(); // 27.5
$number->asInteger(); // 28
$number->asInteger(PHP_ROUND_HALF_DOWN); // 27
$number->asString(); // '27.5'
$number->asString(2); // '27.50'

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable(5.5);

$number = $number->modulus(2.5);

$number->asFloat(); // 0.5
$number->asInteger(); // 1
$number->asInteger(PHP_ROUND_HALF_DOWN); // 0
$number->asString(); // '0.5'
$number->asString(2); // '0.50'

use ElliotJReed\Maths\NumberImmutable;

$number = new NumberImmutable('8.431e-05');

$number->asFloat(); // 0.00008431
$number->asString(); // '0.00008431'

Development

Getting Started

PHP 8.1 or above and Composer is expected to be installed.

Installing Composer

For instructions on how to install Composer visit getcomposer.org.

Installing

After cloning this repository, change into the newly created directory and run:

composer install

or if you have installed Composer locally in your current directory:

php composer.phar install

This will install all dependencies needed for the project.

Henceforth, the rest of this README will assume composer is installed globally (ie. if you are using composer.phar you will need to use composer.phar instead of composer in your terminal / command-line).

Running the Tests

Unit tests

Unit testing in this project is via PHPUnit.

All unit tests can be run by executing:

composer phpunit

Debugging

To have PHPUnit stop and report on the first failing test encountered, run:

composer phpunit:debug

Code formatting

A standard for code style can be important when working in teams, as it means that less time is spent by developers processing what they are reading (as everything will be consistent).

Code formatting is automated via PHP-CS-Fixer. PHP-CS-Fixer will not format line lengths which do form part of the PSR-2 coding standards so these will product warnings when checked by PHP Code Sniffer.

These can be run by executing:

composer phpcs

Running everything

All of the tests can be run by executing:

composer test

Outdated dependencies

Checking for outdated Composer dependencies can be performed by executing:

composer outdated

Validating Composer configuration

Checking that the composer.json is valid can be performed by executing:

composer validate --no-check-publish

Running via GNU Make

If GNU Make is installed, you can replace the above composer command prefixes with make.

All of the tests can be run by executing:

make test

Running the tests on a Continuous Integration platform (eg. Github Actions)

Specific output formats better suited to CI platforms are included as Composer scripts.

To output unit test coverage in text and Clover XML format (which can be used for services such as Coveralls):

composer phpunit:ci

To output PHP-CS-Fixer (dry run) and PHPCS results in checkstyle format (which GitHub Actions will use to output a readable format):

composer phpcs:ci

Github Actions

Look at the example in .github/workflows/main.yml.

Built With

• PHP
• Composer
• PHPUnit
• PHP Code Sniffer
• GNU Make

License

This project is licensed under the MIT License - see the LICENCE.md file for details.