以前小站的固定链接好不人性化，结构是/%year%/%monthnum%/%postname%/，这样看起来又不直观又长的，今天做了一个301重定向，然后修改了新的固定链接，现在的固定链接格式是/%postname%.html，这样看起来短了好多，也直观了好多。
不过小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中去.要不然都是404就悲剧了.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 $rules;
}
add_filter('the_posts'， 'wpdaxue_pm_the_posts'， 20);
add_filter('post_rewrite_rules'， 'wpdaxue_pm_post_rewrite_rules');
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将我的$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格式，然后将这段代码加入到主题的function.php中，然后设置成新的固定链接格式就搞定了。
以上主要介绍了wordpress修改固定链接后301重定向的方法，需要的朋友可以参考下。
