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<?xml version='1.0' encoding="utf-8"?>
<!-- $Revision: 297078 $ -->
<refentry xml:id="arrayobject.uasort" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>ArrayObject::uasort</refname>
<refpurpose>Sort the entries with a user-defined comparison function and maintain key association</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>void</type><methodname>ArrayObject::uasort</methodname>
<methodparam><type>callback</type><parameter>cmp_function</parameter></methodparam>
</methodsynopsis>
<para>
This function sorts the entries such that keys maintain their
correlation with the entry that they are associated with, using a
user-defined comparison function.
</para>
<para>
This is used mainly when sorting associative arrays where the actual
element order is significant.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>cmp_function</parameter></term>
<listitem>
<para>
Function <parameter>cmp_function</parameter> should accept two
parameters which will be filled by pairs of entries.
The comparison function must return an integer less than, equal
to, or greater than zero if the first argument is considered to
be respectively less than, equal to, or greater than the
second.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.void;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>ArrayObject::uasort</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Comparison function
function cmp($a, $b) {
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}
// Array to be sorted
$array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
$arrayObject = new ArrayObject($array);
print_r($arrayObject);
// Sort and print the resulting array
$arrayObject->uasort('cmp');
print_r($arrayObject);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[a] => 4
[b] => 8
[c] => -1
[d] => -9
[e] => 2
[f] => 5
[g] => 3
[h] => -4
)
Array
(
[d] => -9
[h] => -4
[c] => -1
[e] => 2
[g] => 3
[a] => 4
[f] => 5
[b] => 8
)
]]>
</screen>
</example>
</para>
</refsect1>
</refentry>
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