README

WordPress Number library.

Table of contents

• Getting Started
• Usage
• Design Principles

Getting Started

Installation

composer require pronamic/wp-number

Usage

$number = Number::from_float( 123.50 )->add( 0.45 );

echo \esc_html( $number->format_i18n( 2 ) );

Design Principles

A number is a number

In general, a number is a number, not a string, and this means that any programming language treats a number as a number. Thus, the number by itself doesn't imply any specific format (like using .000021 instead of 2.1e-5). This is nothing different to displaying a number with leading zeros (like 0.000021) or aligning lists of numbers. This is a general issue you'll find in any programming language: if you want a specific format you need to specify it, using the format functions of your programming language.

Unless you specify the number as string and convert it to a real number when needed, of course. Some languages can do this implicitly.

https://stackoverflow.com/a/1471792

Number in exponential form / scientific notation

2.1E-5 is the same number as 0.000021. That's how it prints numbers below 0.001. Use printf() if you want it in a particular format.

Edit If you're not familiar with the 2.1E-5 syntax, you should know it is shorthand for 2.1×10-5. It is how most programming languages represent numbers in scientific notation.

https://stackoverflow.com/a/1471694

Leading zeros

In https://github.com/moneyphp/money it is not allowed to use leading zeros:

Leading zeros are not allowed

Source: https://github.com/moneyphp/money/search?q=leading+zero

This probably has somehting to do with the following user note:

Be careful with GMP - it considers leading zeros in a number string as meaning the number is in octal, whereas 'bc' doesn't:

gmp_strval("000100", 10) => 64

bcmul("000100", "1") => 100

Source: https://www.php.net/manual/en/book.gmp.php#106521

<?php
$a = 1234; // decimal number
$a = 0123; // octal number (equivalent to 83 decimal)
$a = 0x1A; // hexadecimal number (equivalent to 26 decimal)
$a = 0b11111111; // binary number (equivalent to 255 decimal)
$a = 1_234_567; // decimal number (as of PHP 7.4.0)
?>

Source: https://www.php.net/manual/en/language.types.integer.php

A leading zero in a numeric literal means "this is octal". But don't be confused: a leading zero in a string does not. Thus: $x = 0123; // 83 $y = "0123" + 0 // 123

Source: https://www.php.net/manual/en/language.types.integer.php#111523

Links

• https://0.30000000000000004.com/