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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.array-chunk" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>array_chunk</refname>
<refpurpose>Split an array into chunks</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_chunk</methodname>
<methodparam><type>array</type><parameter>array</parameter></methodparam>
<methodparam><type>int</type><parameter>length</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>preserve_keys</parameter><initializer>&false;</initializer></methodparam>
</methodsynopsis>
<para>
Chunks an array into arrays with <parameter>length</parameter> elements.
The last chunk may contain less than <parameter>length</parameter> elements.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
The array to work on
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
The size of each chunk
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>preserve_keys</parameter></term>
<listitem>
<para>
When set to &true; keys will be preserved.
Default is &false; which will reindex the chunk numerically
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a multidimensional numerically indexed array, starting with zero,
with each dimension containing <parameter>length</parameter> elements.
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
If <parameter>length</parameter> is less than <literal>1</literal>,
a <classname>ValueError</classname> will be thrown.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
If <parameter>length</parameter> is less than <literal>1</literal>,
a <classname>ValueError</classname> will be thrown now;
previously, an error of level <constant>E_WARNING</constant>
has been raised instead, and the function returned &null;.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_chunk</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$input_array = array('a', 'b', 'c', 'd', 'e');
print_r(array_chunk($input_array, 2));
print_r(array_chunk($input_array, 2, true));
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[0] => Array
(
[0] => a
[1] => b
)
[1] => Array
(
[0] => c
[1] => d
)
[2] => Array
(
[0] => e
)
)
Array
(
[0] => Array
(
[0] => a
[1] => b
)
[1] => Array
(
[2] => c
[3] => d
)
[2] => Array
(
[4] => e
)
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_slice</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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