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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.array-udiff" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_udiff</refname>
<refpurpose>Computes the difference of arrays by using a callback function for data comparison</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_udiff</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 by using a callback function for data
comparison. This is unlike <function>array_diff</function> which uses an
internal function for comparing the data.
</para>
</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>
Returns an array containing all the values of <parameter>array1</parameter>
that are not present in any of the other arguments.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_udiff</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),);
$result = array_udiff($a, $b, array("cr", "comp_func_cr"));
print_r($result);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[0.5] => cr Object
(
[priv_member:private] => 12
)
[0] => cr Object
(
[priv_member:private] => 23
)
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<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
<literal>array_udiff($array1[0], $array2[0], "data_compare_func");</literal>.
</simpara>
</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_diff_uassoc</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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