<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.11 $ -->
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<refentry xml:id="function.key" xmlns="http://docbook.org/ns/docbook">
 <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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