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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.bcmul" xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude">
<refnamediv>
<refname>bcmul</refname>
<refpurpose>Multiply two arbitrary precision numbers</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>bcmul</methodname>
<methodparam><type>string</type><parameter>num1</parameter></methodparam>
<methodparam><type>string</type><parameter>num2</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>scale</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<simpara>
Multiply <parameter>num1</parameter> by <parameter>num2</parameter>.
</simpara>
</refsect1>
<refsect1 role="parameters">
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.bcadd')/db:refsect1[@role='parameters']/*)" />
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the result as a string.
</para>
</refsect1>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.bcadd')/db:refsect1[@role='errors'])" />
<refsect1 role="changelog"><!-- {{{ -->
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>scale</parameter> is now nullable.
</entry>
</row>
<row>
<entry>7.3.0</entry>
<entry>
<function>bcmul</function> now returns numbers with the requested scale.
Formerly, the returned numbers may have omitted trailing decimal zeroes.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1><!-- }}} -->
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>bcmul</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
echo bcmul('1.34747474747', '35', 3); // 47.161
echo bcmul('2', '4'); // 8
?>
]]>
</programlisting>
</example>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
Prior to PHP 7.3.0, <function>bcmul</function> may return a result with fewer digits after the
decimal point than the <parameter>scale</parameter> parameter would
indicate. This only occurs when the result doesn't require all of the
precision allowed by the <parameter>scale</parameter>. For example:
<example>
<title><function>bcmul</function> scale example</title>
<programlisting role="php">
<![CDATA[
<?php
echo bcmul('5', '2', 2); // prints "10", not "10.00"
?>
]]>
</programlisting>
</example>
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>bcdiv</function></member>
<member><methodname>BcMath\Number::mul</methodname></member>
</simplelist>
</para>
</refsect1>
</refentry>
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