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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.array-diff-assoc" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_diff_assoc</refname>
<refpurpose>Computes the difference of arrays with additional index check</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_diff_assoc</methodname>
<methodparam><type>array</type><parameter>array</parameter></methodparam>
<methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
</methodsynopsis>
<para>
Compares <parameter>array</parameter> against <parameter>arrays</parameter> and
returns the difference. Unlike <function>array_diff</function> the array
keys are also used in the comparison.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
The array to compare from
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>arrays</parameter></term>
<listitem>
<para>
Arrays to compare against
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an <type>array</type> containing all the values from
<parameter>array</parameter> that are not present in any of the other arrays.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&array.changelog.require-only-one;
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<!--
<refsect1 role="errors">
&reftitle.errors;
&errors.no.unusual.errors;
</refsect1>
-->
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_diff_assoc</function> example</title>
<para>
In this example the <literal>"a" => "green"</literal>
pair is present in both arrays and thus it is not in the output from the
function. Unlike this, the pair <literal>0 => "red"</literal>
is in the output because the key of <literal>"red"</literal> is
automatically assigned to <literal>0</literal> in the first array,
whereas it is assigned to <literal>1</literal> in the second array as the
key <literal>0</literal> is already taken by <literal>yellow</literal>.
</para>
<programlisting role="php">
<![CDATA[
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[b] => brown
[c] => blue
[0] => red
)
]]>
</screen>
</example>
</para>
<para>
<example>
<title><function>array_diff_assoc</function> example</title>
<para>
Two values from <emphasis>key => value</emphasis> pairs are
considered equal only if <literal>(string) $elem1 === (string)
$elem2 </literal>. In other words a strict check takes place so
the string representations must be the same.
</para>
<programlisting role="php">
<![CDATA[
<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[0] => 0
[1] => 1
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<simpara>
This function only checks one dimension of an n-dimensional
array. It is possible to check deeper dimensions by using, for example,
<literal>array_diff_assoc($array1[0], $array2[0]);</literal>.
</simpara>
</note>
<note>
<simpara>
Ensure arguments are passed in the correct order when comparing similar
arrays with more keys. The new array should be the first in the list.
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_diff</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>
</simplelist>
</para>
</refsect1>
</refentry>
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