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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<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 role="ArrayObject">
<modifier>public</modifier> <type>true</type><methodname>ArrayObject::uasort</methodname>
<methodparam><type>callable</type><parameter>callback</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>
¬e.sort-unstable;
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>callback</parameter></term>
<listitem>
&sort.callback.description;
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.true.always;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&return.type.true;
</tbody>
</tgroup>
</informaltable>
</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);
var_dump($arrayObject);
// Sort and print the resulting array
$arrayObject->uasort('cmp');
var_dump($arrayObject);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
object(ArrayObject)#1 (1) {
["storage":"ArrayObject":private]=>
array(8) {
["a"]=>
int(4)
["b"]=>
int(8)
["c"]=>
int(-1)
["d"]=>
int(-9)
["e"]=>
int(2)
["f"]=>
int(5)
["g"]=>
int(3)
["h"]=>
int(-4)
}
}
object(ArrayObject)#1 (1) {
["storage":"ArrayObject":private]=>
array(8) {
["d"]=>
int(-9)
["h"]=>
int(-4)
["c"]=>
int(-1)
["e"]=>
int(2)
["g"]=>
int(3)
["a"]=>
int(4)
["f"]=>
int(5)
["b"]=>
int(8)
}
}
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><methodname>ArrayObject::asort</methodname></member>
<member><methodname>ArrayObject::ksort</methodname></member>
<member><methodname>ArrayObject::natsort</methodname></member>
<member><methodname>ArrayObject::natcasesort</methodname></member>
<member><methodname>ArrayObject::uksort</methodname></member>
<member><function>uasort</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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