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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<!-- splitted from ./en/functions/array.xml, last change in rev 1.2 -->
<refentry id="function.key">
<refnamediv>
<refname>key</refname>
<refpurpose>Fetch a key from an associative array</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>mixed</type><methodname>key</methodname>
<methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
</methodsynopsis>
<para>
<function>key</function> returns the index element of the
current array position.
</para>
<para>
<example>
<title><function>key</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$array = array(
'fruit1' => 'apple',
'fruit2' => 'orange',
'fruit3' => 'grape',
'fruit4' => 'apple',
'fruit5' => 'apple');
// this cycle echoes all associative array
// key where value equals "apple"
while ($fruit_name = current($array)) {
if ($fruit_name == 'apple') {
echo key($array).'<br />';
}
next($array);
}
?>
]]>
</programlisting>
</example>
</para>
<para>
See also <function>current</function> and <function>next</function>.
</para>
</refsect1>
</refentry>
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