array_change_key_case.php

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· PHP 代码 · 共 63 行

<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Stephan Schmidt <[e-mail]>                             |
// |          Aidan Lister <[e-mail]>                                |
// +----------------------------------------------------------------------+
//
// $Id: array_change_key_case.php 3486 2005-07-29 12:10:48Z nbm $


if (!defined('CASE_LOWER')) {
    define('CASE_LOWER', 0);
}

if (!defined('CASE_UPPER')) {
    define('CASE_UPPER', 1);
}


/**
 * Replace array_change_key_case()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.array_change_key_case
 * @author      Stephan Schmidt <[e-mail]>
 * @author      Aidan Lister <[e-mail]>
 * @version     $Revision: 3486 $
 * @since       PHP 4.2.0
 * @require     PHP 4.0.0 (user_error)
 */
if (!function_exists('array_change_key_case')) {
    function array_change_key_case($input, $case = CASE_LOWER)
    {
        if (!is_array($input)) {
            user_error('array_change_key_case(): The argument should be an array',
                E_USER_WARNING);
            return false;
        }

        $output   = array ();
        $keys     = array_keys($input);
        $casefunc = ($case == CASE_LOWER) ? 'strtolower' : 'strtoupper';

        foreach ($keys as $key) {
            $output[$casefunc($key)] = $input[$key];
        }

        return $output;
    }
}
?>