<?xml version="1.0" encoding="iso-8859-1"?>
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  <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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