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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.10 $ -->
<refentry xml:id="function.array-diff-uassoc" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_diff_uassoc</refname>
<refpurpose>Computes the difference of arrays with additional index check which is performed by a user supplied callback function</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_diff_uassoc</methodname>
<methodparam><type>array</type><parameter>array1</parameter></methodparam>
<methodparam><type>array</type><parameter>array2</parameter></methodparam>
<methodparam choice="opt"><type>array</type><parameter>...</parameter></methodparam>
<methodparam><type>callback</type><parameter>key_compare_func</parameter></methodparam>
</methodsynopsis>
<para>
Compares <parameter>array1</parameter> against <parameter>array2</parameter> and
returns the difference. Unlike <function>array_diff</function> the array
keys are used in the comparision.
</para>
<para>
Unlike <function>array_diff_assoc</function> an user supplied callback
function is used for the indices comparision, not internal function.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array1</parameter></term>
<listitem>
<para>
The array to compare from
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>array2</parameter></term>
<listitem>
<para>
An array to compare against
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>...</parameter></term>
<listitem>
<para>
More arrays to compare against
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>key_compare_func</parameter></term>
<listitem>
<para>
<type>callback</type> function to use.
The callback 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>
Returns an <type>array</type> containing all the entries from
<parameter>array1</parameter> that are not present in any of the other arrays.
</para>
</refsect1>
<!--
<refsect1 role="errors">
&reftitle.errors;
&errors.no.unusual.errors;
</refsect1>
-->
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_diff_uassoc</function> example</title>
<para>
The <literal>"a" => "green"</literal>
pair is present in both arrays and thus it is not in the ouput from the
function. Unlike this, the pair <literal>0 => "red"</literal>
is in the ouput because in the second argument <literal>"red"</literal>
has key which is <literal>1</literal>.
</para>
<programlisting role="php">
<![CDATA[
<?php
function key_compare_func($a, $b)
{
if ($a === $b) {
return 0;
}
return ($a > $b)? 1:-1;
}
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[b] => brown
[c] => blue
[0] => red
)
]]>
</screen>
<simpara>
The equality of 2 indices is checked by the user supplied callback function.
</simpara>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
This function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using, for example,
<literal>array_diff_uassoc($array1[0], $array2[0], "key_compare_func");</literal>.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_diff</function></member>
<member><function>array_diff_assoc</function></member>
<member><function>array_udiff</function></member>
<member><function>array_udiff_assoc</function></member>
<member><function>array_udiff_uassoc</function></member>
<member><function>array_intersect</function></member>
<member><function>array_intersect_assoc</function></member>
<member><function>array_uintersect</function></member>
<member><function>array_uintersect_assoc</function></member>
<member><function>array_uintersect_uassoc</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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