Introduction
For arbitrary precision mathematics PHP offers the Binary Calculator which
supports numbers of any size and precision, represented as strings.
Requirements
Since PHP 4.0.4, libbcmath is bundled with PHP. You don't need any
external libraries for this extension.
Installation
In PHP 4, these functions are only available if PHP was
configured with --enable-bcmath.
In PHP 3, these functions are only available if PHP was
NOT configured with --disable-bcmath.
The windows version of PHP
has built in support for this extension. You do not need to load any additional
extension in order to use these functions.
Runtime Configuration
The behaviour of these functions is affected by settings in php.ini.
Table 1. BC math configuration options
| Name | Default | Changeable |
|---|
| bcmath.scale | 0 | PHP_INI_ALL |
For further details and definition of the PHP_INI_* constants see
ini_set().
Here's a short explanation of
the configuration directives.
- bcmath.scale
integer
Number of decimal digits for all bcmath functions.
Resource Types
This extension has no resource types defined.
Predefined Constants
This extension has no constants defined.
