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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-keys">
<refnamediv>
<refname>array_keys</refname>
<refpurpose>Return all the keys of an array</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>array_keys</methodname>
<methodparam><type>array</type><parameter>input</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>search_value</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>strict</parameter><initializer>false</initializer></methodparam>
</methodsynopsis>
<para>
<function>array_keys</function> returns the keys, numeric and
string, from the <parameter>input</parameter> array.
</para>
<para>
If the optional <parameter>search_value</parameter> is specified,
then only the keys for that value are returned. Otherwise, all
the keys from the <parameter>input</parameter> are returned.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>input</parameter></term>
<listitem>
<para>
An array containing keys to return.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>search_value</parameter></term>
<listitem>
<para>
If specified, then only keys containing these values are returned.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>strict</parameter></term>
<listitem>
<para>
Determines if strict comparison (===) should be used during the search.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an array of all the keys in <parameter>input</parameter>.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.0.0</entry>
<entry>
Added the <parameter>strict</parameter> parameter.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>array_keys</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));
$array = array("blue", "red", "green", "blue", "blue");
print_r(array_keys($array, "blue"));
$array = array("color" => array("blue", "red", "green"),
"size" => array("small", "medium", "large"));
print_r(array_keys($array));
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Array
(
[0] => 0
[1] => color
)
Array
(
[0] => 0
[1] => 3
[2] => 4
)
Array
(
[0] => color
[1] => size
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>array_values</function></member>
<member><function>array_key_exists</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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