让人怒吼的WordPress 分类 404

今天Sophia特别告诉我工作达人下方的连结都点不进去，这奇怪的问题ㄚ琪一直搞不懂是server升级后的问题，还是Wordpress升级后的问题造成。

ㄚ琪就把问题假设是固定网址的问题，发现好像不是。

再把问题假设成是Apache 的mod_rewrite没有开，去检查也有开？

继续找了一个早上，发现How To Fix the 3.1 Custom Permalinks Bug这一篇提到，这是3.1版的问题？

好奇怪以前怎没有注意到这个问题？好吧，先把它当死马医吧。

ㄚ琪在自制布景主题里的functions.php中放入了文中建议的程式码：

// repairs the custom permalink bug with WordPress 3.1+
// works with or w/out custom permalinks enabled

add_action('init', 'wcs_hotfix_31_redirect_canonical', -1);

remove_filter('template_redirect', 'redirect_canonical');

function wcs_hotfix_31_redirect_canonical()
{
    // hotfix version: 0.97
    // developed by Luke America with valuable assistance by Jonas Nordstrom

    // source code release 2011-03-23
    // updated 2011-04-05 (added fixes to pagination for searches, categories, & tags)
    // updated 2011-04-08 (added support for multisites that use subdirectories)
    // updated 2011-04-09 (added hotfix bypass to retain XML-RPC Support)
    // updated 2011-04-11 (added fixes for RSS feeds for categories & tags)

    global $wp_version;

    // does NOT assume bug will be fixed by next version release
    if ((!is_admin()) && ($wp_version >= 3.1))
    {
        // extract current URI
        $uri = untrailingslashit($_SERVER['REQUEST_URI']);

        // bypass hotfix to retain XML-RPC Support
        $pos = strpos($uri, 'xmlrpc.php');
        if ($pos >= 1) {return;}

        // process hotfix for custom permalink CAT lookup
        $pos = strpos($uri, 'category/');
        if ($pos >= 1)
        {
            // prep fix for CAT rss feeds
            $feed = '';
            if (strpos($uri, 'feed'))
            {
                $feed = '&feed=rss2';
                $uri = substr($uri, 0, strlen($uri) - 5);
            }
            // continue CAT hotfix
            $pos = strrpos($uri, '/');
            $len = strlen($uri);
            $cat_slug = substr($uri, $pos + 1, $len - $pos - 1);
            $cat_id_object = get_category_by_slug($cat_slug);
            $cat_id = $cat_id_object->term_id;
            $url = site_url('?cat=' . $cat_id . $feed);
            header("Location: $url");
            exit;
        }

        // process hotfix for custom permalink TAG lookup
        $pos = strpos($uri, 'tag/');
        if ($pos >= 1)
        {
            // prep fix for TAG rss feeds
            $feed = '';
            if (strpos($uri, 'feed'))
            {
                $feed = '&feed=rss2';
                $uri = substr($uri, 0, strlen($uri) - 5);
            }
            // continue TAG hotfix
            $pos = strrpos($uri, '/');
            $len = strlen($uri);
            $tag_slug = substr($uri, $pos + 1, $len - $pos - 1);
            $url = site_url('?tag=' . $tag_slug . $feed);
            header("Location: $url");
            exit;
        }

        if (empty($_SERVER['QUERY_STRING']))
        {
             // handle true 404's, normal processing, etc
            redirect_canonical();
        }
        else
        {
            // fix pagination for categories, tags, and searches
            $page_query = wcs_hotfix_31_get_page($uri);
            if ($page_query != '')
            {
                $url = site_url() . $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
                $url .= '&' . $page_query;
                header("Location: $url");
                exit;
            }

            // handle default queries (not needed)
            //$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
        }
    }

    /**********************************************************************
     Copyright c 2011 Gizmo Digital Fusion (http://wpCodeSnippets.info)
     you can redistribute and/or modify this code under the terms of the
     GNU GPL v2: http://www.gnu.org/licenses/gpl-2.0.html
    **********************************************************************/
}

function wcs_hotfix_31_get_page($uri)
{
    // init
    $page = '';
    $pos = strpos($uri, 'page/');

    // convert to page query
    if ($pos >= 1)
    {
        $page = substr($uri, $pos + 5);
        $page = 'paged=' . intval($page);
    }

    // exit
    return $page;
}

OK！测试成功，收工，等等，网址那里怎会变成非固定网址啊？还是觉得有点怪怪的，希望下一版的Wordpress有解。