For arbitrary precision mathematics PHP offers the Binary Calculator which
supports numbers of any size and precision, represented as strings.
Since PHP 4.0.4, libbcmath is bundled with PHP. You don't need any
external libraries for this extension.
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.
The behaviour of these functions is affected by settings in php.ini.
Table 1. BC math configuration options
For further details and definitions of the
PHP_INI_* constants, see the Appendix G
Here's a short explanation of
the configuration directives.
Number of decimal digits for all bcmath functions. See also
This extension has no resource types defined.
This extension has no constants defined.