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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.38 -->
<refentry id="function.strnatcmp">
<refnamediv>
<refname>strnatcmp</refname>
<refpurpose>
String comparisons using a "natural order" algorithm
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>int</type><methodname>strnatcmp</methodname>
<methodparam><type>string</type><parameter>str1</parameter></methodparam>
<methodparam><type>string</type><parameter>str2</parameter></methodparam>
</methodsynopsis>
<para>
This function implements a comparison algorithm that orders
alphanumeric strings in the way a human being would, 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>strcmp</function>) can be seen
below:
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
$arr1 = $arr2 = array("img12.png", "img10.png", "img2.png", "img1.png");
echo "Standard string comparison\n";
usort($arr1, "strcmp");
print_r($arr1);
echo "\nNatural order string comparison\n";
usort($arr2, "strnatcmp");
print_r($arr2);
?>
]]>
</programlisting>
</informalexample>
The code above will generate the following output:
<informalexample>
<screen>
<![CDATA[
Standard string comparison
Array
(
[0] => img1.png
[1] => img10.png
[2] => img12.png
[3] => img2.png
)
Natural order string comparison
Array
(
[0] => img1.png
[1] => img2.png
[2] => img10.png
[3] => img12.png
)
]]>
</screen>
</informalexample>
For more information see: Martin Pool's <ulink
url="&url.strnatcmp;">Natural Order String Comparison</ulink>
page.
</para>
<simpara>
Similar to other string comparison functions, this one returns
< 0 if <parameter>str1</parameter> is less than
<parameter>str2</parameter>; > 0 if
<parameter>str1</parameter> is greater than
<parameter>str2</parameter>, and 0 if they are equal.
</simpara>
<simpara>
Note that this comparison is case sensitive.
</simpara>
<simpara>
See also <function>ereg</function>,
<function>strcasecmp</function>, <function>substr</function>,
<function>stristr</function>, <function>strcmp</function>,
<function>strncmp</function>, <function>strncasecmp</function>,
<function>strnatcasecmp</function>, <function>strstr</function>,
<function>natsort</function> and <function>natcasesort</function>.
</simpara>
</refsect1>
</refentry>
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