useful recursive PHP functions

recursively ...

PHP Manual for

IV. BCMath Arbitrary Precision Mathematics Functions

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

NameDefaultChangeablebcmath.scale0PHP_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. See also bcscale().

Resource Types

This extension has no resource types defined.

Predefined Constants

This extension has no constants defined.

Table of Contents bcadd -- Add two arbitrary precision numbersbccomp -- Compare two arbitrary precision numbersbcdiv -- Divide two arbitrary precision numbersbcmod -- Get modulus of an arbitrary precision numberbcmul -- Multiply two arbitrary precision numberbcpow -- Raise an arbitrary precision number to anotherbcpowmod -- Raise an arbitrary precision number to another, reduced by a specified modulus.bcscale -- Set default scale parameter for all bc math functionsbcsqrt -- Get the square root of an arbitrary precision numberbcsub -- Subtract one arbitrary precision number from another