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 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. See also bcscale().
This extension has no resource types defined.
This extension has no constants defined.