V. BCMath Arbitrary Precision Mathematics Functions

Introduktion

For arbitrary precision mathematics PHP offers the Binary Calculator which supports numbers of any size and precision, represented as strings.

Krav

Since PHP 4.0.4, libbcmath is bundled with PHP. You don't need any external libraries for this extension.

Installation

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.

Windows-versionen av PHP har inbyggt st�d f�r det h�r till�gget. Du beh�ver inte ladda n�gra ytterligare till�gg f�r att anv�nda dessa funktioner.

Konfiguration under drift

De h�r funktionernas beteende p�verkas av inst�llningarna i php.ini.

Tabell 1. BC math configuration options

NameDefaultChangeableChangelog
bcmath.scale"0"PHP_INI_ALLAvailable since PHP 5.0.0.
For further details and definitions of the PHP_INI_* constants, see the Appendix H.

H�r f�ljer en kort f�rklaring av konfigurationsdirektiven.

bcmath.scale integer

Number of decimal digits for all bcmath functions. See also bcscale().

Resurstyper

Den h�r utbyggnaden har inte n�gra resurstyper definerade.

F�rdefinerade konstanter

Den h�r utbyggnaden har inte n�gra konstanter definerade.

Innehållsförteckning
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