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A PHP Library to Handle Calculations on Monies of Any Size cover image

A PHP Library to Handle Calculations on Monies of Any Size

Brick/Money is a money and currency library for PHP that handles exact calculations on monies of any size. When you are working with financial data then it is a serious matter, and small rounding mistakes in an application may lead to serious consequences in real life. That's why floating-point arithmetic is not suited for monetary calculations. So we can use this library that is based on brick/math and handles exact calculations on monies of any size.


This library is installable via Composer:

composer require brick/money


This library requires PHP 7.4 or later.

Creating a Money

To create Money, call the of() factory method:

use Brick\Money\Money;

$money = Money::of(50, 'USD'); // USD 50.00
$money = Money::of('19.9', 'USD'); // USD 19.90

Alternatively, you can create Money from a number of "minor units" (cents), using the ofMinor() method:

use Brick\Money\Money;

$money = Money::ofMinor(1234, 'USD'); // USD 12.34

Basic operations

Money is an immutable class: its value never changes, so it can be safely passed around. All operations on a Money, therefore, return a new instance:

use Brick\Money\Money;

$money = Money::of(50, 'USD');

echo $money->plus('4.99'); // USD 54.99
echo $money->minus(1); // USD 49.00
echo $money->multipliedBy('1.999'); // USD 99.95
echo $money->dividedBy(4); // USD 12.50

You can add and subtract Money instances as well:

use Brick\Money\Money;

$cost = Money::of(25, 'USD');
$shipping = Money::of('4.99', 'USD');
$discount = Money::of('2.50', 'USD');

echo $cost->plus($shipping)->minus($discount); // USD 27.49

If the two Money instances are not of the same currency, an exception is thrown:

use Brick\Money\Money;

$a = Money::of(1, 'USD');
$b = Money::of(1, 'EUR');

$a->plus($b); // MoneyMismatchException

If the result needs rounding, a rounding mode must be passed as a second parameter, or an exception is thrown:

use Brick\Money\Money;
use Brick\Math\RoundingMode;

$money = Money::of(50, 'USD');

$money->plus('0.999'); // RoundingNecessaryException
$money->plus('0.999', RoundingMode::DOWN); // USD 50.99

$money->minus('0.999'); // RoundingNecessaryException
$money->minus('0.999', RoundingMode::UP); // USD 49.01

$money->multipliedBy('1.2345'); // RoundingNecessaryException
$money->multipliedBy('1.2345', RoundingMode::DOWN); // USD 61.72

$money->dividedBy(3); // RoundingNecessaryException
$money->dividedBy(3, RoundingMode::UP); // USD 16.67

Cash rounding

Some currencies do not allow the same increments for cash and cashless payments. For example, CHF (Swiss Franc) has 2 fraction digits and allows increments of 0.01 CHF, but Switzerland does not have coins of less than 5 cents, or 0.05 CHF.

You can deal with such monies using CashContext:

use Brick\Money\Money;
use Brick\Money\Context\CashContext;
use Brick\Math\RoundingMode;

$money = Money::of(10, 'CHF', new CashContext(5)); // CHF 10.00
$money->dividedBy(3, RoundingMode::DOWN); // CHF 3.30
$money->dividedBy(3, RoundingMode::UP); // CHF 3.35

Custom scale

You can use custom scale monies by providing a CustomContext:

use Brick\Money\Money;
use Brick\Money\Context\CustomContext;
use Brick\Math\RoundingMode;

$money = Money::of(10, 'USD', new CustomContext(4)); // USD 10.0000
$money->dividedBy(7, RoundingMode::UP); // USD 1.4286

Auto scale

If you need monies that adjust their scale to fit the operation result, then AutoContext is for you:

use Brick\Money\Money;
use Brick\Money\Context\AutoContext;

$money = Money::of('1.10', 'USD', new AutoContext()); // USD 1.1
$money->multipliedBy('2.5'); // USD 2.75
$money->dividedBy(8); // USD 0.1375

Advanced calculations

You may occasionally need to chain several operations on a Money, and only apply a rounding mode on the very last step; if you applied a rounding mode on every single operation, you might end up with a different result. This is where RationalMoney comes into play. This class internally stores the amount as a rational number (a fraction). You can create a RationalMoney from a Money, and conversely:

use Brick\Money\Money;
use Brick\Math\RoundingMode;

$money = Money::of('9.5', 'EUR') // EUR 9.50
  ->toRational() // EUR 950/100
  ->dividedBy(3) // EUR 950/300
  ->plus('17.795') // EUR 6288500/300000
  ->multipliedBy('1.196') // EUR 7521046000/300000000
  ->to($money->getContext(), RoundingMode::DOWN) // EUR 25.07

This package has a lot of other features and options, If you wanna dig more, please visit Github.

Published at : 06-12-2022

Author : Rizwan Aslam
Rizwan Aslam

I am a highly results-driven professional with 12+ years of collective experience in the grounds of web application development especially in laravel, native android application development in java, and desktop application development in the dot net framework. Now managing a team of expert developers at Codebrisk.

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