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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.16 $ -->
<refentry xml:id="function.natsort" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>natsort</refname>
<refpurpose>Sort an array using a "natural order" algorithm</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>natsort</methodname>
<methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
</methodsynopsis>
<para>
This function implements a sort algorithm that orders alphanumeric strings
in the way a human being would while maintaining key/value associations.
This is described as a "natural ordering". An example of the difference
between this algorithm and the regular computer string sorting algorithms
(used in <function>sort</function>) can be seen in the example below.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
The input array.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>natsort</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$array1 = $array2 = array("img12.png", "img10.png", "img2.png", "img1.png");
sort($array1);
echo "Standard sorting\n";
print_r($array1);
natsort($array2);
echo "\nNatural order sorting\n";
print_r($array2);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Standard sorting
Array
(
[0] => img1.png
[1] => img10.png
[2] => img12.png
[3] => img2.png
)
Natural order sorting
Array
(
[3] => img1.png
[2] => img2.png
[1] => img10.png
[0] => img12.png
)
]]>
</screen>
<para>
For more information see: Martin Pool's <link
xlink:href="&url.strnatcmp;">Natural Order String Comparison</link>
page.
</para>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>natcasesort</function></member>
<member><function>strnatcmp</function></member>
<member><function>strnatcasecmp</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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