array_combine.php.svn-base

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。」· SVN-BASE 代码 · 共 71 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: Aidan Lister <[e-mail]>                                |
// +----------------------------------------------------------------------+
//
// $Id$


/**
 * Replace array_combine()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.array_combine
 * @author      Aidan Lister <[e-mail]>
 * @version     $Revision$
 * @since       PHP 5
 * @require     PHP 4.0.0 (user_error)
 */
if (!function_exists('array_combine')) {
    function array_combine($keys, $values)
    {
        if (!is_array($keys)) {
            user_error('array_combine() expects parameter 1 to be array, ' .
                gettype($keys) . ' given', E_USER_WARNING);
            return;
        }

        if (!is_array($values)) {
            user_error('array_combine() expects parameter 2 to be array, ' .
                gettype($values) . ' given', E_USER_WARNING);
            return;
        }

        $key_count = count($keys);
        $value_count = count($values);
        if ($key_count !== $value_count) {
            user_error('array_combine() Both parameters should have equal number of elements', E_USER_WARNING);
            return false;
        }

        if ($key_count === 0 || $value_count === 0) {
            user_error('array_combine() Both parameters should have number of elements at least 0', E_USER_WARNING);
            return false;
        }

        $keys    = array_values($keys);
        $values  = array_values($values);

        $combined = array();
        for ($i = 0; $i < $key_count; $i++) {
            $combined[$keys[$i]] = $values[$i];
        }

        return $combined;
    }
}

?>