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130 lines
3.2 KiB
XML
Executable File
130 lines
3.2 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 0c9c2dd669fe9395eaa73d487fbd160f9057429a Maintainer: HonestQiao Status: ready -->
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<!-- CREDITS: mowangjuanzi -->
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<refentry xml:id="function.dechex" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>dechex</refname>
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<refpurpose>十进制转换为十六进制</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>string</type><methodname>dechex</methodname>
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<methodparam><type>int</type><parameter>num</parameter></methodparam>
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</methodsynopsis>
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<para>
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返回一字符串，包含有给定
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<parameter>num</parameter>
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参数的十六进制表示。
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</para>
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<para>
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所能转换的最大数值为十进制的
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<constant>PHP_INT_MAX</constant><literal> * 2 + 1</literal> (或
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<literal>-1</literal>)：在 32 位平台上是十进制的 <literal>4294967295</literal>，其 <function>dechex</function> 的结果为 <literal>ffffffff</literal>。
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>num</parameter></term>
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<listitem>
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<para>
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要转换的十进制值
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</para>
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<para>
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PHP 的 <type>int</type> 类型是有符号的，但 <function>dechex</function> 处理无符号整数，负正数会以无符号处理。
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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<parameter>num</parameter> 的16进制表示
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>dechex</function> 示例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo dechex(10) . "\n";
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echo dechex(47);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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a
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2f
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title>大整数的 <function>dechex</function> 示例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// 下面的输出假设是 32 位平台。
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// 注意输出的所有值一样。
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echo dechex(-1)."\n";
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echo dechex(PHP_INT_MAX * 2 + 1)."\n";
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echo dechex(pow(2, 32) - 1)."\n";
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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ffffffff
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ffffffff
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ffffffff
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>hexdec</function></member>
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<member><function>decbin</function></member>
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<member><function>decoct</function></member>
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<member><function>base_convert</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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