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bcmod.xml
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141 lines (133 loc) · 3.85 KB
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: c7e83fbbbcde9f54affc09424d032c38492a3ff4 Maintainer: jakquan Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.bcmod" xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude">
<refnamediv>
<refname>bcmod</refname>
<refpurpose>任意精度数字取模</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>bcmod</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>
<para>
对 <parameter>num1</parameter> 使用 <parameter>num2</parameter> 取模。结果与
<parameter>num1</parameter> 的符号相同。
</para>
</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>
返回字符串类型取模后的结果。
</para>
</refsect1>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.bcdiv')/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>
现在 <parameter>scale</parameter> 可以为 null。
</entry>
</row>
<row>
<entry>8.0.0</entry>
<entry>
现在，除以 <literal>0</literal> 会引发 <exceptionname>DivisionByZeroError</exceptionname> 异常，而不是返回 &null;。
</entry>
</row>
<row>
<entry>7.2.0</entry>
<entry>
现在
<parameter>num1</parameter> 和 <parameter>num2</parameter> 不会截断成整数。
所以现在 <function>bcmod</function> 的表现更接近 <function>fmod</function>
而不是 <literal>%</literal> 操作符。
</entry>
</row>
<row>
<entry>7.2.0</entry>
<entry>
新增参数 <parameter>scale</parameter>。
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1><!-- }}} -->
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>bcmod</function> 示例</title>
<programlisting role="php">
<![CDATA[
<?php
bcscale(0);
echo bcmod( '5', '3'); // 2
echo bcmod( '5', '-3'); // 2
echo bcmod('-5', '3'); // -2
echo bcmod('-5', '-3'); // -2
?>
]]>
</programlisting>
</example>
<example>
<title>带小数点的 <function>bcmod</function></title>
<programlisting role="php">
<![CDATA[
<?php
bcscale(1);
echo bcmod('5.7', '1.3'); // PHP 7.2.0 起是 0.5；之前是 0
?>
]]>
</programlisting>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>bcdiv</function></member>
<member><function>bcdivmod</function></member>
<member><methodname>BcMath\Number::mod</methodname></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->