mirror of
https://github.com/sigmasternchen/php-doc-en
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ca01897d64
that PHP treats the parameter as an unsigned int, and working through some of the implications of that from a userland perspective. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@327571 c90b9560-bf6c-de11-be94-00142212c4b1
131 lines
3.2 KiB
XML
131 lines
3.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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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>Decimal to hexadecimal</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>number</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns a string containing a hexadecimal representation of the given
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unsigned <parameter>number</parameter> argument.
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</para>
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<para>
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The largest number that can be converted is
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<constant>PHP_INT_MAX</constant><literal> * 2 + 1</literal> (or
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<literal>-1</literal>): on 32-bit platforms, this will be
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<literal>4294967295</literal> in decimal, which results in
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<function>dechex</function> returning <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>number</parameter></term>
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<listitem>
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<para>
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The decimal value to convert.
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</para>
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<para>
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As PHP's <type>integer</type> type is signed, but
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<function>dechex</function> deals with unsigned integers, negative
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integers will be treated as though they were unsigned.
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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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Hexadecimal string representation of <parameter>number</parameter>.
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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> example</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><function>dechex</function> example with large integers</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// The output below assumes a 32-bit platform.
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// Note that the output is the same for all values.
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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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