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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.array-walk-recursive" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_walk_recursive</refname>
<refpurpose>Apply a user function recursively to every member of an array</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>true</type><methodname>array_walk_recursive</methodname>
<methodparam><type class="union"><type>array</type><type>object</type></type><parameter role="reference">array</parameter></methodparam>
<methodparam><type>callable</type><parameter>callback</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>arg</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
Applies the user-defined <parameter>callback</parameter> function to each
element of the <parameter>array</parameter>. This function will recurse
into deeper arrays.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
The input array.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>callback</parameter></term>
<listitem>
<para>
Typically, <parameter>callback</parameter> takes on two parameters.
The <parameter>array</parameter> parameter's value being the first, and
the key/index second.
</para>
<note>
<para>
If <parameter>callback</parameter> needs to be working with the
actual values of the array, specify the first parameter of
<parameter>callback</parameter> as a
<link linkend="language.references">reference</link>. Then,
any changes made to those elements will be made in the
original array itself.
</para>
</note>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>arg</parameter></term>
<listitem>
<para>
If the optional <parameter>arg</parameter> parameter is supplied,
it will be passed as the third parameter to the
<parameter>callback</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.true.always;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&return.type.true;
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_walk_recursive</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$sweet = array('a' => 'apple', 'b' => 'banana');
$fruits = array('sweet' => $sweet, 'sour' => 'lemon');
function test_print($item, $key)
{
echo "$key holds $item\n";
}
array_walk_recursive($fruits, 'test_print');
?>
]]>
</programlisting>
&example.outputs;
<screen role="php">
<![CDATA[
a holds apple
b holds banana
sour holds lemon
]]>
</screen>
<para>
You may notice that the key '<literal>sweet</literal>' is never displayed. Any key that holds an
<type>array</type> will not be passed to the function.
</para>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_walk</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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