array_intersect_key.php

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<?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: array_intersect_key.php 3486 2005-07-29 12:10:48Z nbm $


/**
 * Replace array_intersect_key()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/function.array_intersect_key
 * @author      Tom Buskens <[e-mail]>
 * @version     $Revision: 3486 $
 * @since       PHP 5.0.2
 * @require     PHP 4.0.0 (user_error)
 */
if (!function_exists('array_intersect_key')) {
    function array_intersect_key()
    {
        $args = func_get_args();
        if (count($args) < 2) {
            user_error('Wrong parameter count for array_intersect_key()', E_USER_WARNING);
            return;
        }

        // Check arrays
        $array_count = count($args);
        for ($i = 0; $i !== $array_count; $i++) {
            if (!is_array($args[$i])) {
                user_error('array_intersect_key() Argument #' .
                    ($i + 1) . ' is not an array', E_USER_WARNING);
                return;
            }
        }

        // Compare entries
        $result = array();
        foreach ($args[0] as $key1 => $value1) {
            for ($i = 1; $i !== $array_count; $i++) {
                foreach ($args[$i] as $key2 => $value2) {
                    if ((string) $key1 === (string) $key2) {
                        $result[$key1] = $value1;
                    }
                }
            }
        }

        return $result;
    }
}

?>