BCMath Arbitrary Precision Mathematics Functions

Introductie

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

Afhankelijkheden

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

Installatie

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.

Deze functies worden automatisch ingebouwd in de windows versie van PHP. Er zijn geen extra handelingen nodig om deze functies te gebruiken.

Configuratie tijdens scriptuitvoer

Het gedrag van deze functies wordt beïnvloed vanuit php.ini.

**BC math configuration options**
Name	Default	Changeable	Changelog
bcmath.scale	"0"	PHP_INI_ALL

For further details and definitions of the PHP_INI_* constants, see the php.ini directives.

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

Deze extensie maakt geen gebruik van resources.

Voorgedefinieerde constanten

Deze extensie definieert geen constanten.

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