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<reference id="ref.bc">
<title>BC (Arbitrary Precision) Functions</title>
<titleabbrev>BC math</titleabbrev>
<partintro>
<simpara>
These BC functions are only available if PHP was compiled with the
--enable-bcmath configure option.
</partintro>
<refentry id="function.bcadd">
<refnamediv>
<refname>bcadd</refname>
<refpurpose>Add two arbitrary precision numbers.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcadd</function></funcdef>
<paramdef>string <parameter>left operand</parameter></paramdef>
<paramdef>string <parameter>right operand</parameter></paramdef>
<paramdef>int <parameter><optional>scale</optional></parameter></paramdef>
</funcsynopsis>
<para>
Adds the <parameter>left operand</parameter> to the
<parameter>right operand</parameter> and returns the
sum in a string. The optional <parameter>scale</parameter>
parameter is used to set the number of digits after the decimal
place in the result.
<para>
See also <function>bcsub</function>.
</refsect1>
</refentry>
<refentry id="function.bccomp">
<refnamediv>
<refname>bccomp</refname>
<refpurpose>Compare two arbitrary precision numbers.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>int <function>bccomp</function></funcdef>
<paramdef>string <parameter>left operand</parameter></paramdef>
<paramdef>string <parameter>right operand</parameter></paramdef>
<paramdef>int <parameter><optional>scale</optional></parameter></paramdef>
</funcsynopsis>
<para>
Compares the <parameter>left operand</parameter> to the
<parameter>right operand</parameter> and returns the
result as an integer. The optional <parameter>scale</parameter>
parameter is used to set the number of digits after the decimal place
which will be used in the comparion. The return value is 0 if the
two operands are equal. If the <parameter>left operand</parameter>
is larger than the <parameter>right operand</parameter> the return
value is +1 and if the <parameter>left operand</parameter> is less than
the <parameter>right operand</parameter> the return value is -1.
</refsect1>
</refentry>
<refentry id="function.bcdiv">
<refnamediv>
<refname>bcdiv</refname>
<refpurpose>Divide two arbitrary precision numbers.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcdiv</function></funcdef>
<paramdef>string <parameter>left operand</parameter></paramdef>
<paramdef>string <parameter>right operand</parameter></paramdef>
<paramdef>int <parameter><optional>scale</optional></parameter></paramdef>
</funcsynopsis>
<para>
Divides the <parameter>left operand</parameter> by the
<parameter>right operand</parameter> and returns the result. The optional
<parameter>scale</parameter> sets the number of digits after the decimal
place in the result.
<para>
See also <function>bcmul</function>.
</refsect1>
</refentry>
<refentry id="function.bcmod">
<refnamediv>
<refname>bcmod</refname>
<refpurpose>Get modulus of an arbitrary precision number.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcmod</function></funcdef>
<paramdef>string <parameter>left operand</parameter></paramdef>
<paramdef>string <parameter>modulus</parameter></paramdef>
</funcsynopsis>
<para>
Get the modulus of the <parameter>left operand</parameter> using
<parameter>modulus</parameter>.
<para>
See also <function>bcdiv</function>.
</refsect1>
</refentry>
<refentry id="function.bcmul">
<refnamediv>
<refname>bcmul</refname>
<refpurpose>Multiply two arbitrary precision number.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcmul</function></funcdef>
<paramdef>string <parameter>left operand</parameter></paramdef>
<paramdef>string <parameter>right operand</parameter></paramdef>
<paramdef>int <parameter><optional>scale</optional></parameter></paramdef>
</funcsynopsis>
<para>
Multiply the <parameter>left operand</parameter> by the
<parameter>right operand</parameter> and returns the result. The optional
<parameter>scale</parameter> sets the number of digits after the decimal
place in the result.
<para>
See also <function>bcdiv</function>.
</refsect1>
</refentry>
<refentry id="function.bcpow">
<refnamediv>
<refname>bcpow</refname>
<refpurpose>Raise an arbitrary precision number to another.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcpow</function></funcdef>
<paramdef>string <parameter>x</parameter></paramdef>
<paramdef>string <parameter>y</parameter></paramdef>
<paramdef>int <parameter><optional>scale</optional></parameter></paramdef>
</funcsynopsis>
<para>
Raise <parameter>x</parameter> to the power <parameter>y</parameter>.
The <parameter>scale</parameter> can be used to set the number of digits
after the decimal place in the result.
<para>
See also <function>bcsqrt</function>.
</refsect1>
</refentry>
<refentry id="function.bcscale">
<refnamediv>
<refname>bcscale</refname>
<refpurpose>Set default scale parameter for all bc math functions.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcscale</function></funcdef>
<paramdef>int <parameter>scale</parameter></paramdef>
</funcsynopsis>
<para>
This function sets the default scale parameter for all subsequent bc math functions
that do not explicitly specify a scale parameter.
</refsect1>
</refentry>
<refentry id="function.bcsqrt">
<refnamediv>
<refname>bcsqrt</refname>
<refpurpose>Get the square root of an arbitray precision number.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcsqrt</function></funcdef>
<paramdef>string <parameter>operand</parameter></paramdef>
<paramdef>int <parameter>scale</parameter></paramdef>
</funcsynopsis>
<para>
Return the square root of the <parameter>operand</parameter>. The
optional <parameter>scale</parameter> parameter sets the number of
digits after the decimal place in the result.
<para>
See also <function>bcpow</function>.
</refsect1>
</refentry>
<refentry id="function.bcsub">
<refnamediv>
<refname>bcsub</refname>
<refpurpose>Subtract one arbitrary precision number from another.</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcdef>string <function>bcsub</function></funcdef>
<paramdef>string <parameter>left operand</parameter></paramdef>
<paramdef>string <parameter>right operand</parameter></paramdef>
<paramdef>int <parameter><optional>scale</optional></parameter></paramdef>
</funcsynopsis>
<para>
Subtracts the <parameter>right operand</parameter> from the
<parameter>left operand</parameter> and returns the
result in a string. The optional <parameter>scale</parameter>
parameter is used to set the number of digits after the decimal
place in the result.
<para>
See also <function>bcadd</function>.
</refsect1>
</refentry>
</reference>
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