   #PHP Manual Function Reference aspell_suggest bcadd

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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
   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.

   Table of Contents
   bcadd -- Add two arbitrary precision numbers
   bccomp -- Compare two arbitrary precision numbers
   bcdiv -- Divide two arbitrary precision numbers
   bcmod --  Get modulus of an arbitrary precision number
   bcmul -- Multiply two arbitrary precision number
   bcpow --  Raise an arbitrary precision number to another
   bcpowmod --  Raise an arbitrary precision number to another, reduced
          by a specified modulus.

   bcscale --  Set default scale parameter for all bc math functions
   bcsqrt --  Get the square root of an arbitrary precision number
   bcsub --  Subtract one arbitrary precision number from another
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