README

This module provides various classes for performing precision mathematics using BC MATH internally

See http://php.net/manual/en/book.bc.php for more information on the BC Math Extension

Licence

This library is copyright 2014, 2015 Switch Systems Ltd and is licenced under the Mozilla Public License 2.0.

Number Class

The precision number class provides all the basic math operations provides by the BC Math extension

Numbers are immutable and will always return a new object with the value of the operation.

Example:

$number = new Number('20'); // Instatiates Number object with a value of 20
$result = $number->add('20'); // returns a new instance of Number with a value of 40
echo $result; // prints '40' 

Number Collection Class

The number collection can be instatiated with an array as the first argument. It has various methods for performing basic math operations on the set

• Mean
• Median
• Standard Deviation
• Range

Example:

$numberCollection = new NumberCollection(['1', '2', '3']);
$mean = $numberCollection->mean(); // returns a new instance of number set to the value of the mean of the set
echo $mean; // prints '2'

Tax Utility

This utility class can be instatiated to perform basic tax operations. It takes tax rate as the first argument of the constructor

Methods:

fetchValueOfTaxToBeAdded

Returns the value of tax that would be added:

$vatUtil = new TaxUtility('20');
$vat = $vatUtil->fetchValueOfTaxToBeAdded('125'); // Returns instance of number set to '25'
echo $vat // prints '25'

fetchValueOfAddedTax

Returns the value of tax that would be added:

$vatUtil = new TaxUtility('20');
$vat = $vatUtil->fetchValueOfAddedTax('150'); // Returns instance of number set to '25'
echo $vat // prints '25'

addTaxTo

Returns the value of tax that would be added:

$vatUtil = new TaxUtility('20');
$priceWithVat = $vatUtil->addTaxTo('125'); // Returns instance of number set to '150'
echo $priceWithVat // prints '150'

removeTaxFrom

Returns the value of tax that would be added:

$vatUtil = new TaxUtility('20');
$priceWithVatRemoved = $vatUtil->removeTaxFrom('150'); // Returns instance of number set to '125'
echo $priceWithVatRemoved // prints '125'

Finance Utility

Currently only provides one method:

calculatePayForPeriod

$financeUtil = new FinanceUtility();
$pay = $financeUtil->calculatePayForPeriod($startDateTimeObject, $endDateTimeObject, '6.50', '30');

Decimal DateTime Utility

This class has a variety of methods for calculating time in a specified unit for a date range and various convertion methods