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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.dechex" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>dechex</refname>
<refpurpose>Decimal to hexadecimal</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>dechex</methodname>
<methodparam><type>int</type><parameter>num</parameter></methodparam>
</methodsynopsis>
<para>
Returns a string containing a hexadecimal representation of the given
unsigned <parameter>num</parameter> argument.
</para>
<para>
The largest number that can be converted is
<constant>PHP_INT_MAX</constant><literal> * 2 + 1</literal> (or
<literal>-1</literal>): on 32-bit platforms, this will be
<literal>4294967295</literal> in decimal, which results in
<function>dechex</function> returning <literal>ffffffff</literal>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>num</parameter></term>
<listitem>
<para>
The decimal value to convert.
</para>
<para>
As PHP's <type>int</type> type is signed, but
<function>dechex</function> deals with unsigned integers, negative
integers will be treated as though they were unsigned.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Hexadecimal string representation of <parameter>num</parameter>.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>dechex</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
echo dechex(10) . "\n";
echo dechex(47);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
a
2f
]]>
</screen>
</example>
</para>
<para>
<example>
<title><function>dechex</function> example with large integers</title>
<programlisting role="php">
<![CDATA[
<?php
// The output below assumes a 32-bit platform.
// Note that the output is the same for all values.
echo dechex(-1)."\n";
echo dechex(PHP_INT_MAX * 2 + 1)."\n";
echo dechex(pow(2, 32) - 1)."\n";
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
ffffffff
ffffffff
ffffffff
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>hexdec</function></member>
<member><function>decbin</function></member>
<member><function>decoct</function></member>
<member><function>base_convert</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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