archived-doc-es/reference/array/functions/key.xml

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<!-- $Revision: 1.3 $ -->
<!-- EN-Revision: 1.9 Maintainer: baoengb Status: ready -->
<!-- splitted from ./es/functions/array.xml, last change in rev 1.1 -->
  <refentry id="function.key">
   <refnamediv>
    <refname>key</refname>
    <refpurpose>Obtiene una clave de una matriz asociativa</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Descripci&oacute;n</title>
     <methodsynopsis>
     <type>mixed</type><methodname>key</methodname>
     <methodparam><type>array</type><parameter role="reference">key</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>key</function> devuelve el elemento &iacute;ndice de la 
     posici&oacute;n actual en la matriz.
    </para>
    <para>
     <example>
      <title>Ejmeplo</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>
     Vea tambi&eacute;n: <function>current</function>, <function>next</function>
    </para>
   </refsect1>
  </refentry>

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