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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.array-udiff-assoc" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_udiff_assoc</refname>
<refpurpose>Computes the difference of arrays with additional index check, compares data by a callback function</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_udiff_assoc</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>data_compare_func</parameter></methodparam>
</methodsynopsis>
<para>
Computes the difference of arrays with additional index check, compares
data by a callback function.
</para>
<note>
<simpara>
Please note that this function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using, for example,
<literal>array_udiff_assoc($array1[0], $array2[0], "some_comparison_func");</literal>.
</simpara>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array1</parameter></term>
<listitem>
<para>
The first array.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>array2</parameter></term>
<listitem>
<para>
The second array.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>data_compare_func</parameter></term>
<listitem>
<para>
The callback comparison function.
</para>
<para>
The user supplied callback function is used for comparison.
It 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>
<function>array_udiff_assoc</function> returns an <type>array</type>
containing all the values from <parameter>array1</parameter>
that are not present in any of the other arguments.
Note that the keys are used in the comparison unlike
<function>array_diff</function> and <function>array_udiff</function>.
The comparison of arrays' data is performed by using an user-supplied
callback. In this aspect the behaviour is opposite to the behaviour of
<function>array_diff_assoc</function> which uses internal function for
comparison.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_udiff_assoc</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
class cr {
private $priv_member;
function cr($val)
{
$this->priv_member = $val;
}
static function comp_func_cr($a, $b)
{
if ($a->priv_member === $b->priv_member) return 0;
return ($a->priv_member > $b->priv_member)? 1:-1;
}
}
$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);
$result = array_udiff_assoc($a, $b, array("cr", "comp_func_cr"));
print_r($result);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[0.1] => cr Object
(
[priv_member:private] => 9
)
[0.5] => cr Object
(
[priv_member:private] => 12
)
[0] => cr Object
(
[priv_member:private] => 23
)
)
]]>
</screen>
</example>
</para>
<simpara>
In our example above you see the <literal>"1" => new cr(4)</literal>
pair is present in both arrays and thus it is not in the output from the
function.
</simpara>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_diff</function></member>
<member><function>array_diff_assoc</function></member>
<member><function>array_diff_uassoc</function></member>
<member><function>array_udiff</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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