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  <refentry id="function.array-change-key-case">
   <refnamediv>
    <refname>array_change_key_case</refname>
    <refpurpose>Returns an array with all string keys lowercased or uppercased</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>array</type><methodname>array_change_key_case</methodname>
      <methodparam><type>array</type><parameter>input</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>case</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>array_change_key_case</function> changes the
     keys in the <parameter>input</parameter> array to
     be all lowercase or uppercase. The change depends
     on the last optional <parameter>case</parameter>
     parameter. You can pass two constants there,
     <constant>CASE_UPPER</constant> and
     <constant>CASE_LOWER</constant>. The default is
     <constant>CASE_LOWER</constant>. The function will leave
     number indices as is.
    </para>
    <example>
     <title><function>array_change_key_case</function> example</title>
     <programlisting role="php">
<![CDATA[
<?php
$input_array = array("FirSt" => 1, "SecOnd" => 4);
print_r(array_change_key_case($input_array, CASE_UPPER));
?>
]]>
     </programlisting>
     <para>
      The printout of the above program will be:
     </para>
     <screen>
<![CDATA[
Array
(
    [FIRST] => 1
    [SECOND] => 4
)
]]>
     </screen>
    </example>
    <para>
     If an array has indices that will be the same once run through this
     function (e.g. "keY" and "kEY"), the value that is later in the array
     will override other indices.
    </para>   
   </refsect1>
  </refentry>

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