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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- splitted from ./en/functions/array.xml, last change in rev 1.14 -->
<refentry id="function.array-diff-assoc">
<refnamediv>
<refname>array_diff_assoc</refname>
<refpurpose>Computes the difference of arrays with additional index check</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>array</type><methodname>array_diff_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>
</methodsynopsis>
<para>
<function>array_diff_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>.
</para>
<para>
<example>
<title><function>array_diff_assoc</function> example</title>
<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>
<simpara>
In our example above you see 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>.
</simpara>
<simpara>
Two values from <emphasis>key => value</emphasis> pairs are
considered equal only if <literal>(string) $elem1 === (string)
$elem2 </literal>. In other words a strict check takes place so
the string representations must be the same.
<!-- TODO: example of it... -->
</simpara>
<note>
<simpara>
Please note that this function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using, for example,
<literal>array_diff_assoc($array1[0], $array2[0]);</literal>.
</simpara>
</note>
<para>
See also <function>array_diff</function>,
<function>array_intersect</function>,
and <function>array_intersect_assoc</function>.
</para>
</refsect1>
</refentry>
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