php-doc-en/reference/array/functions/array-change-key-case.xml

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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>
   &example.outputs;
   <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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