WordPress修改固定链接后，如何解决已收录页面404问题

之前本站的固定链接设置的很不好，结构是/%year%/%monthnum%/%postname%/，这样看起来又又长不直观。

今天勺子做了一个301重定向,修改了新的固定链接,现在的固定链接格式是/%postname%-%post_id%.html，这样看起来短了好多,也美观了好多。

不过本站已经被搜索引擎收录了好多,以前的地址都无法访问了,所以要做好301重定向,跳转到新的固定链接所生成的地址。要不然都是404死链，会被百度惩罚。

废话不多说，下面贴出解决办法：


$rewrite_config = array();
$rewrite_config['highpriority'] = true ;
$rewrite_config['rewrite'] = array();
$rewrite_config['oldstructure'] = "/%year%/%monthnum%/%postname%/";
 
function wpdaxue_pm_the_posts($post) {
    global $wp;
    global $wp_rewrite;
    global $rewrite_config;
 
    $rewrite_config['rewrite'] = $wp_rewrite->generate_rewrite_rule($rewrite_config['oldstructure'], false, true, true, true);
    if ($post != NULL && is_single() && $rewrite_config['oldstructure'] != $wp_rewrite->permalink_structure) {
        if (array_key_exists($wp->matched_rule, $rewrite_config['rewrite'])) {
        // ok, we need to generate a 301 Permanent redirect here.
            header("HTTP/1.1 301 Moved Permanently", TRUE, 301);
            header('Status: 301 Moved Permanently');
            $permalink = get_permalink($post[0]->ID);
            if (is_feed()) {
                $permalink = trailingslashit($permalink) . 'feed/';
            }
            header("Location: ". $permalink);
            exit();
        }
    }
    return $post;
}
 
function wpdaxue_pm_post_rewrite_rules($rules) {
    global $wp_rewrite;
    global $rewrite_config;
    $oldstruct = $rewrite_config['oldstructure'];
 
    if ($oldstruct != NULL && $oldstruct != $wp_rewrite->permalink_structure) {
        $rewrite_config['rewrite'] = $wp_rewrite->generate_rewrite_rule($oldstruct, false, true, true, true);
        if ($rewrite_config ['highpriority'] == true) {
            return array_merge($rewrite_config['rewrite'], $rules);
        } else {
            return array_merge($rules, $rewrite_config['rewrite']);
        }
    }
    return $rules;
}
add_filter('the_posts', 'wpdaxue_pm_the_posts', 20);
add_filter('post_rewrite_rules', 'wpdaxue_pm_post_rewrite_rules');

将我的$rewrite_config['oldstructure'] = “/%year%/%monthnum%/%postname%/”后面的/%year%/%monthnum%/%postname%/修改成你自己的旧的固定链接。

然后将这段代码加入到你的当前主题的function.php中，然后设置成新的固定链接格式就OK了.

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