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>BCMath Arbitrary Precision Mathematics Functions</TITLE
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>IV. BCMath Arbitrary Precision Mathematics Functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN9507"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="bc.intro"
></A
>Introduction</H1
><P
> For arbitrary precision mathematics PHP offers the Binary Calculator which
supports numbers of any size and precision, represented as strings.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="bc.requirements"
></A
>Requirements</H1
><P
> Since PHP 4.0.4, libbcmath is bundled with PHP. You don't need any
external libraries for this extension.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="bc.installation"
></A
>Installation</H1
><P
> In PHP 4, these functions are only available if <TT
CLASS="literal"
>PHP</TT
> was
configured with <TT
CLASS="option"
>--enable-bcmath</TT
>.
In PHP 3, these functions are only available if <TT
CLASS="literal"
>PHP</TT
> was
NOT configured with <TT
CLASS="option"
>--disable-bcmath</TT
>.
</P
><P
> The windows version of <TT
CLASS="literal"
>PHP</TT
>
has built in support for this extension. You do not need to load any additional
extension in order to use these functions.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="bc.configuration"
></A
>Runtime Configuration</H1
><P
> The behaviour of these functions is affected by settings in <TT
CLASS="filename"
>php.ini</TT
>.
</P
><P
> <DIV
CLASS="table"
><A
NAME="AEN9528"
></A
><P
><B
>Table 1. BC math configuration options</B
></P
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><TH
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>Name</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Default</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Changeable</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>bcmath.scale</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>0</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_INI_ALL</TD
></TR
></TBODY
></TABLE
></DIV
>
For further details and definition of the PHP_INI_* constants see
<A
HREF="function.ini-set.html"
><B
CLASS="function"
>ini_set()</B
></A
>.
</P
><P
> Here is a short explanation of the configuration directives.
<P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><A
NAME="ini.bcmath.scale"
></A
><TT
CLASS="parameter"
><I
>bcmath.scale</I
></TT
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
> Number of decimal digits for all bcmath functions.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="bc.resources"
></A
>Resource Types</H1
><P
>This extension has no resource types defined.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="bc.constants"
></A
>Predefined Constants</H1
><P
>This extension has no constants defined.</P
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="function.bcadd.html"
>bcadd</A
> -- Add two arbitrary precision numbers</DT
><DT
><A
HREF="function.bccomp.html"
>bccomp</A
> -- Compare two arbitrary precision numbers</DT
><DT
><A
HREF="function.bcdiv.html"
>bcdiv</A
> -- Divide two arbitrary precision numbers</DT
><DT
><A
HREF="function.bcmod.html"
>bcmod</A
> --
Get modulus of an arbitrary precision number
</DT
><DT
><A
HREF="function.bcmul.html"
>bcmul</A
> -- Multiply two arbitrary precision number</DT
><DT
><A
HREF="function.bcpow.html"
>bcpow</A
> --
Raise an arbitrary precision number to another
</DT
><DT
><A
HREF="function.bcpowmod.html"
>bcpowmod</A
> --
Raise an arbitrary precision number to another, reduced by a specified modulus.
</DT
><DT
><A
HREF="function.bcscale.html"
>bcscale</A
> --
Set default scale parameter for all bc math functions
</DT
><DT
><A
HREF="function.bcsqrt.html"
>bcsqrt</A
> --
Get the square root of an arbitrary precision number
</DT
><DT
><A
HREF="function.bcsub.html"
>bcsub</A
> --
Subtract one arbitrary precision number from another
</DT
></DL
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