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<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="bcmath-number.mul" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
<refnamediv>
<refname>BcMath\Number::mul</refname>
<refpurpose>Multiplies an arbitrary precision number</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis role="BcMath\\Number">
<modifier>public</modifier> <type>BcMath\Number</type><methodname>BcMath\Number::mul</methodname>
<methodparam><type class="union"><type>BcMath\Number</type><type>string</type><type>int</type></type><parameter>num</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>scale</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<simpara>
Multiplies <varname>$this</varname> by <parameter>num</parameter>.
</simpara>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>num</parameter></term>
<listitem>
<simpara>
The multiplier.
</simpara>
</listitem>
</varlistentry>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('bcmath-number.add')/db:refsect1[@role='parameters']/descendant::db:varlistentry[2])" />
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<simpara>
Returns the result of multiplication as a new <classname>BcMath\Number</classname> object.
</simpara>
<simpara>
When the <property>BcMath\Number::scale</property> of the result object is automatically set,
the sum of the <property>BcMath\Number::scale</property>s of the two values used for multiplication is used.
</simpara>
<simpara>
That is, if the <property>BcMath\Number::scale</property>s of two values are <literal>2</literal>
and <literal>5</literal> respectively, the <property>BcMath\Number::scale</property> of the result
will be <literal>7</literal>.
</simpara>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<!-- ValueError cases -->
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('bcmath-number.div')/db:refsect1[@role='errors']/db:para[1])" />
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><methodname>BcMath\Number::mul</methodname> example when <parameter>scale</parameter> is not specified</title>
<programlisting role="php">
<![CDATA[
<?php
$number = new BcMath\Number('1.234');
$ret1 = $number->mul(new BcMath\Number('2.3456'));
$ret2 = $number->mul('-3.4');
$ret3 = $number->mul(7);
var_dump($number, $ret1, $ret2, $ret3);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
object(BcMath\Number)#1 (2) {
["value"]=>
string(5) "1.234"
["scale"]=>
int(3)
}
object(BcMath\Number)#3 (2) {
["value"]=>
string(9) "2.8944704"
["scale"]=>
int(7)
}
object(BcMath\Number)#2 (2) {
["value"]=>
string(7) "-4.1956"
["scale"]=>
int(4)
}
object(BcMath\Number)#4 (2) {
["value"]=>
string(5) "8.638"
["scale"]=>
int(3)
}
]]>
</screen>
</example>
<example>
<title><methodname>BcMath\Number::mul</methodname> example of explicitly specifying <parameter>scale</parameter></title>
<programlisting role="php">
<![CDATA[
<?php
$number = new BcMath\Number('1.234');
$ret1 = $number->mul(new BcMath\Number('2.3456'), 1);
$ret2 = $number->mul('-3.4', 10);
$ret3 = $number->mul(7, 0);
var_dump($number, $ret1, $ret2, $ret3);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
object(BcMath\Number)#1 (2) {
["value"]=>
string(5) "1.234"
["scale"]=>
int(3)
}
object(BcMath\Number)#3 (2) {
["value"]=>
string(3) "2.8"
["scale"]=>
int(1)
}
object(BcMath\Number)#2 (2) {
["value"]=>
string(13) "-4.1956000000"
["scale"]=>
int(10)
}
object(BcMath\Number)#4 (2) {
["value"]=>
string(1) "8"
["scale"]=>
int(0)
}
]]>
</screen>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><function>bcmul</function></member>
<member><methodname>BcMath\Number::div</methodname></member>
<member><methodname>BcMath\Number::pow</methodname></member>
<member><methodname>BcMath\Number::powmod</methodname></member>
</simplelist>
</refsect1>
</refentry>
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