This article follows up on my earlier investigation into Polylang multi-domain behavior and W3 Total Cache object caching.
Previous troubleshooting record:
In the previous article, the new CSS had already been saved to the WordPress database, but the English domain continued to read a stale object. I eventually confirmed that, in this Polylang multi-domain setup, the www and en Hosts could end up with inconsistent code or object update states when W3TC Object Cache used Redis as its storage backend.
This time, the symptom was even more obvious: date links in the calendar on the English homepage were being assembled into malformed URLs containing two complete domain names.
1. Symptom: Two Complete URLs in a Calendar Link
The site’s current language structure is:
中文站：https://www.shuijingwanwq.com/
英文站：https://en.shuijingwanwq.com/
After opening the English homepage and hovering over a date in the calendar, I could see that the link had become:
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/08/
The correct link should have been:
https://en.shuijingwanwq.com/2026/07/08/
The malformed URL contained both:
旧英文目录结构：
https://www.shuijingwanwq.com/en/
当前英文子域名结构：
https://en.shuijingwanwq.com/
In other words, a complete English-subdomain URL was treated as a relative path and appended to the old /en/ address.
Calendar links on the Chinese site were correct; only the English subdomain was affected.
2. Initial Suspicions: W3 Total Cache or Polylang
The site currently uses all of the following:
Polylang 多域名模式
W3 Total Cache Page Cache
W3 Total Cache Object Cache
Redis 对象缓存后端
Cloudflare
I had also recently migrated the English site from:
https://www.shuijingwanwq.com/en/
to:
https://en.shuijingwanwq.com/
When I first saw this link, the obvious possibilities were:
Polylang 日期归档链接生成错误
W3TC 缓存了迁移前的语言配置
Redis 中仍然保存旧的首页 URL
Cloudflare 返回旧页面
However, after inspecting the WPCode snippet I had previously written for the calendar, I quickly found the first direct cause.
3. The First Root Cause: The Old WPCode Snippet Still Built Links Around /en/
I had previously added a calendar-fix snippet to address inconsistent post dates across languages in Polylang.
It performs the following tasks:
- Query the dates with posts in the current language for the selected month;
- Add links to dates that should have posts;
- Remove incorrect links that belong only to other languages;
- Rebuild the previous-month and next-month navigation;
- Correct the language prefix in date archive links.
The old version constructed URLs for non-default languages as follows:
$home_url = home_url( '/' );
$fix_url = function( $url ) use (
$current_lang,
$default_lang,
$home_url
) {
if ( $current_lang === $default_lang ) {
return $url;
}
if (
preg_match(
'#^' . preg_quote( $home_url, '#' ) . '[a-z]{2}/#i',
$url
)
) {
$url = preg_replace(
'#^' . preg_quote( $home_url, '#' ) . '[a-z]{2}/#i',
'',
$url
);
$url = $home_url . $url;
}
if (
strpos(
$url,
$home_url . $current_lang . '/'
) === false
) {
$relative = str_replace(
$home_url,
'',
$url
);
return $home_url .
$current_lang .
'/' .
$relative;
}
return $url;
};
This code was written when the English site still used the /en/ path.
At that time, the URL structure was:
https://www.shuijingwanwq.com/en/2026/07/08/
The following concatenation logic therefore made sense in the old architecture:
$home_url . $current_lang . '/'
It generated:
https://www.shuijingwanwq.com/ + en/
After the migration to a dedicated subdomain, however, Polylang could already return:
https://en.shuijingwanwq.com/2026/07/08/
The old code still continued to execute:
$relative = str_replace(
$home_url,
'',
$url
);
At this point:
$home_url：
https://www.shuijingwanwq.com/
$url：
https://en.shuijingwanwq.com/2026/07/08/
Because the two URLs used different Hosts, str_replace() could not remove the primary domain.
As a result, $relative remained a complete absolute URL:
https://en.shuijingwanwq.com/2026/07/08/
The code then continued concatenating the value:
return $home_url .
$current_lang .
'/' .
$relative;
The final result was:
https://www.shuijingwanwq.com/
+
en/
+
https://en.shuijingwanwq.com/2026/07/08/
This was the malformed link that actually appeared on the page:
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/08/
4. Why the Chinese Site Was Not Affected
The old code contains the following condition:
if ( $current_lang === $default_lang ) {
return $url;
}
Chinese is the current default language, so the function immediately returns the original URL for the Chinese site.
Only non-default languages such as English continue into the /en/ concatenation logic.
The resulting behavior was therefore:
www.shuijingwanwq.com：正常
en.shuijingwanwq.com：错误
This matched the observed behavior exactly.
5. The Fix: Stop Hard-Coding /en/ and Use Polylang’s Actual Language Homepage
The existing logic for querying posts by language, adding missing date links, removing incorrect links, and rebuilding month navigation was still useful.
What needed to be removed was:
$home_url . $current_lang . '/'
The new version uses:
pll_home_url( $current_lang )
to retrieve the homepage actually configured for the current language.
This supports all of the following configurations:
语言目录：
https://example.com/en/
语言子域名：
https://en.example.com/
独立语言域名：
https://example-en.com/
The core URL normalization function used in this revision is shown below:
/**
* 将日期归档 URL 归一化到指定语言的真实首页。
*/
function swq_polylang_calendar_language_url(
$url,
$lang
) {
if ( ! function_exists( 'pll_home_url' ) ) {
return $url;
}
$language_home = pll_home_url( $lang );
if ( empty( $language_home ) ) {
return $url;
}
$source_parts = wp_parse_url( $url );
$target_parts = wp_parse_url( $language_home );
if (
! is_array( $source_parts ) ||
! is_array( $target_parts ) ||
empty( $target_parts['host'] )
) {
return $url;
}
$target_scheme = ! empty(
$target_parts['scheme']
)
? $target_parts['scheme']
: 'https';
$target_origin =
$target_scheme .
'://' .
$target_parts['host'];
if ( ! empty( $target_parts['port'] ) ) {
$target_origin .=
':' .
(int) $target_parts['port'];
}
$source_path = ! empty(
$source_parts['path']
)
? '/' . ltrim(
$source_parts['path'],
'/'
)
: '/';
$target_base_path = ! empty(
$target_parts['path']
)
? '/' . trim(
$target_parts['path'],
'/'
)
: '';
if ( '/' === $target_base_path ) {
$target_base_path = '';
}
/*
* 收集所有语言首页中的路径部分。
* 如果来源 URL 仍然包含旧语言目录，
* 先将其移除。
*/
$known_language_paths = array();
if ( function_exists( 'pll_languages_list' ) ) {
$languages = pll_languages_list(
array(
'hide_empty' => 0,
'fields' => 'slug',
)
);
foreach (
(array) $languages as $language_slug
) {
$home_parts = wp_parse_url(
pll_home_url( $language_slug )
);
if (
! is_array( $home_parts ) ||
empty( $home_parts['path'] )
) {
continue;
}
$language_path =
'/' .
trim(
$home_parts['path'],
'/'
);
if ( '/' !== $language_path ) {
$known_language_paths[] =
$language_path;
}
}
}
$known_language_paths = array_values(
array_unique( $known_language_paths )
);
usort(
$known_language_paths,
static function ( $a, $b ) {
return strlen( $b ) <=> strlen( $a );
}
);
foreach (
$known_language_paths as $language_path
) {
if (
$source_path === $language_path ||
0 === strpos(
$source_path,
$language_path . '/'
)
) {
$source_path = substr(
$source_path,
strlen( $language_path )
);
$source_path =
'/' .
ltrim(
(string) $source_path,
'/'
);
break;
}
}
$had_trailing_slash =
'/' === substr( $source_path, -1 );
$final_path =
'/' .
trim(
trim(
$target_base_path,
'/'
) .
'/' .
ltrim(
$source_path,
'/'
),
'/'
);
if (
'/' !== $final_path &&
$had_trailing_slash
) {
$final_path = trailingslashit(
$final_path
);
}
$final_url = $target_origin . $final_path;
if ( ! empty( $source_parts['query'] ) ) {
$source_query_args = array();
wp_parse_str(
$source_parts['query'],
$source_query_args
);
if ( ! empty( $source_query_args ) ) {
$final_url = add_query_arg(
$source_query_args,
$final_url
);
}
}
return esc_url_raw( $final_url );
}
Date links were changed to:
$correct_url =
swq_polylang_calendar_language_url(
get_day_link(
$calendar_year,
$calendar_month,
$day_num
),
$current_lang
);
The previous-month link was changed to:
$previous_link =
swq_polylang_calendar_language_url(
get_month_link(
$previous_year,
$previous_month
),
$current_lang
);
The next-month link was changed to:
$next_link =
swq_polylang_calendar_language_url(
get_month_link(
$next_year,
$next_month
),
$current_lang
);
After saving and enabling the new WPCode snippet, the English date links should theoretically have been fixed immediately.
In practice, it was not that simple.
6. The English Site Still Ran the Old Version After the New Code Was Saved
The new code had been saved and enabled successfully in WPCode.
I then ran the following action in the WordPress dashboard:
性能 → 清除所有缓存
To check whether the language selected in the Polylang dashboard affected cache purging, I switched the top toolbar between:
中文（中国）
English
I then ran “Purge All Caches” again.
Neither attempt had any effect.
The date links on the English homepage were still:
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/08/
The result was unchanged in a private browsing window.
Even when I opened a URL with a query parameter:
https://en.shuijingwanwq.com/?cache=1
the page continued to output the old links.
This ruled out a simple browser-cache explanation.
7. The Malformed Links Persisted When Accessing the Origin Directly
To rule out Cloudflare, I used --resolve to map the English domain directly to 127.0.0.1 on the origin server:
url="https://en.shuijingwanwq.com/?calendar_origin_v3=$(date +%s%N)"
curl -sS \
--resolve en.shuijingwanwq.com:443:127.0.0.1 \
-H "Cache-Control: no-cache" \
-H "Pragma: no-cache" \
-D /tmp/en-calendar-origin.headers \
-o /tmp/en-calendar-origin.html \
"$url"
I then checked for malformed links:
grep -oE \
'https://www\.shuijingwanwq\.com/en/https://en\.shuijingwanwq\.com[^"< ]*' \
/tmp/en-calendar-origin.html \
| sort -u
The command returned 12 malformed URLs, including:
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/06/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/01/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/02/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/03/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/04/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/05/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/06/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/07/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/08/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/09/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/10/
https://www.shuijingwanwq.com/en/https://en.shuijingwanwq.com/2026/07/11/
This showed that:
Cloudflare 不是本次错误链接的直接来源
源站返回的 HTML 本身就是错误的
8. Using a POST Request to Further Rule Out Origin Page Cache
To avoid the current GET page-cache path as much as possible, I also sent a POST request to the English origin:
url="https://en.shuijingwanwq.com/?calendar_post_v3=$(date +%s%N)"
curl -sS \
--resolve en.shuijingwanwq.com:443:127.0.0.1 \
-X POST \
--data "swq_calendar_test=$(date +%s%N)" \
-D /tmp/en-calendar-post.headers \
-o /tmp/en-calendar-post.html \
"$url"
I counted the malformed links again:
grep -o \
'https://www\.shuijingwanwq\.com/en/https://en\.shuijingwanwq\.com' \
/tmp/en-calendar-post.html \
| wc -l
The result was still:
12
At this point, I could reasonably conclude:
The English Host was most likely still running a previously cached version of the code rather than the V3 code I had just saved.
9. Confirming Different Code Loads Between the Two Hosts with a Temporary Response Header
To confirm whether the new code was actually being loaded, I temporarily added a response header to the WPCode snippet:
add_action(
'send_headers',
function () {
header(
'X-SWQ-Calendar-V3-Loaded: yes'
);
},
999
);
I then accessed the same origin directly using the www and en Hosts:
for host in \
"www.shuijingwanwq.com" \
"en.shuijingwanwq.com"
do
file_key="$(echo "$host" | tr '.' '_')"
url="https://${host}/?calendar_v3_host_test=$(date +%s%N)"
curl -sS \
--resolve "${host}:443:127.0.0.1" \
-X POST \
--data "swq_test=$(date +%s%N)" \
-D "/tmp/${file_key}.headers" \
-o /dev/null \
"$url"
echo
echo "========== ${host} =========="
grep -iE \
'^HTTP/|^x-swq-calendar-v3-loaded:' \
"/tmp/${file_key}.headers"
done
The responses were:
========== www.shuijingwanwq.com ==========
HTTP/2 200
x-swq-calendar-v3-loaded: yes
========== en.shuijingwanwq.com ==========
HTTP/2 200
The result was unambiguous:
www Host 已经加载 V3
en Host 没有加载 V3
Both domains used:
同一个 WordPress 根目录
同一套插件
同一个数据库
同一个 Redis
同一个 WPCode 片段
However, the two Hosts were actually loading different versions of the code.
This closely resembled the behavior documented in the previous article: the database had been updated, but the English Host continued to read a stale object.
10. Bootstrapping WordPress Under the English Host and Flushing W3TC Object Cache
I did not use the following command directly:
redis-cli FLUSHDB
Flushing the entire Redis database would have had too broad an impact, and the current Redis instance might also contain other cached data.
Instead, I used the following approach:
- Simulate an
en.shuijingwanwq.comrequest environment on the command line; - Load WordPress;
- Retrieve W3TC’s
CacheFlushcomponent; - Call
objectcache_flush().
Command:
WP_LOAD="$(find /data/wwwroot -maxdepth 3 \
-type f \
-path '*/www.shuijingwanwq.com/wp-load.php' \
-print -quit)"
if [ -z "$WP_LOAD" ]; then
echo "未找到 wp-load.php"
exit 1
fi
cd "$(dirname "$WP_LOAD")" || exit 1
php -d display_errors=1 -r '
$_SERVER["HTTP_HOST"] = "en.shuijingwanwq.com";
$_SERVER["SERVER_NAME"] = "en.shuijingwanwq.com";
$_SERVER["SERVER_PORT"] = "443";
$_SERVER["HTTPS"] = "on";
$_SERVER["REQUEST_METHOD"] = "GET";
$_SERVER["REQUEST_URI"] = "/";
$_SERVER["SERVER_PROTOCOL"] = "HTTP/1.1";
define("WP_USE_THEMES", false);
require getcwd() . "/wp-load.php";
if (!class_exists("\W3TC\Dispatcher")) {
fwrite(
STDERR,
"错误：W3 Total Cache 未加载\n"
);
exit(1);
}
try {
$cache_flush =
\W3TC\Dispatcher::component(
"CacheFlush"
);
$result =
$cache_flush->objectcache_flush();
echo "英文 Host 的 W3TC Object Cache 清理已调用\n";
echo "返回值：";
var_export($result);
echo PHP_EOL;
} catch (\Throwable $exception) {
fwrite(
STDERR,
"清理失败：" .
$exception->getMessage() .
PHP_EOL
);
exit(1);
}
'
Result:
英文 Host 的 W3TC Object Cache 清理已调用
返回值：NULL
NULL did not mean the operation had failed, because no exception was thrown during execution.
The only way to confirm that it had worked was to check the English Host again.
11. The English Host Loaded the New Code Immediately After the Flush
I checked www and en again:
for host in \
"www.shuijingwanwq.com" \
"en.shuijingwanwq.com"
do
key="$(echo "$host" | tr '.' '_')"
url="https://${host}/?calendar_after_object_flush=$(date +%s%N)"
curl -sS \
--resolve "${host}:443:127.0.0.1" \
-X POST \
--data "swq_test=$(date +%s%N)" \
-D "/tmp/${key}-after-flush.headers" \
-o "/tmp/${key}-after-flush.html" \
"$url"
echo
echo "========== ${host} =========="
echo "-- V3 Header --"
grep -iE \
'^HTTP/|^x-swq-calendar-v3-loaded:' \
"/tmp/${key}-after-flush.headers"
echo "-- Malformed URL Count --"
grep -o \
'https://www\.shuijingwanwq\.com/en/https://en\.shuijingwanwq\.com' \
"/tmp/${key}-after-flush.html" \
| wc -l
echo "-- Correct July 8 Link --"
grep -o \
'href="https://en\.shuijingwanwq\.com/2026/07/08/"' \
"/tmp/${key}-after-flush.html" \
| head -1
done
The responses were:
========== www.shuijingwanwq.com ==========
-- V3 Header --
HTTP/2 200
x-swq-calendar-v3-loaded: yes
-- Malformed URL Count --
0
-- Correct July 8 Link --
========== en.shuijingwanwq.com ==========
-- V3 Header --
HTTP/2 200
x-swq-calendar-v3-loaded: yes
-- Malformed URL Count --
0
-- Correct July 8 Link --
href="https://en.shuijingwanwq.com/2026/07/08/"
Before the flush:
en Host 没有 V3 响应头
错误 URL 数量：12
After the flush:
en Host 已加载 V3
错误 URL 数量：0
日期链接已经恢复正常
The calendar on the English homepage was now correct in the browser as well.
12. Saving the Flush Command as a Reusable Server Script
This was not the first time I had encountered:
www 已加载新内容
en 仍然读取旧对象
后台清除全部缓存无效
Rather than copying a long PHP command each time, it made more sense to save it as a server script.
Create a directory:
mkdir -p /root/bin
Create the script:
cat > /root/bin/w3tc-flush-host-object-cache <<'BASH'
#!/usr/bin/env bash
set -Eeuo pipefail
HOST="${1:-}"
WP_ROOT="/data/wwwroot/www.shuijingwanwq.com"
case "$HOST" in
www.shuijingwanwq.com|en.shuijingwanwq.com)
;;
*)
echo "用法："
echo " $0 www.shuijingwanwq.com"
echo " $0 en.shuijingwanwq.com"
exit 2
;;
esac
if [ ! -f "$WP_ROOT/wp-load.php" ]; then
echo "错误：未找到 $WP_ROOT/wp-load.php"
exit 1
fi
php -d display_errors=1 -r '
$host = $argv[1];
$wp_root = $argv[2];
$_SERVER["HTTP_HOST"] = $host;
$_SERVER["SERVER_NAME"] = $host;
$_SERVER["SERVER_PORT"] = "443";
$_SERVER["HTTPS"] = "on";
$_SERVER["REQUEST_METHOD"] = "GET";
$_SERVER["REQUEST_URI"] = "/";
$_SERVER["SERVER_PROTOCOL"] = "HTTP/1.1";
define("WP_USE_THEMES", false);
chdir($wp_root);
require $wp_root . "/wp-load.php";
if (!class_exists("\W3TC\Dispatcher")) {
fwrite(
STDERR,
"错误：W3 Total Cache 未加载\n"
);
exit(1);
}
try {
$cache_flush =
\W3TC\Dispatcher::component(
"CacheFlush"
);
$cache_flush->objectcache_flush();
echo "已按以下 Host 启动 WordPress，";
echo "并调用 W3TC Object Cache 清理：\n";
echo $host . PHP_EOL;
} catch (\Throwable $exception) {
fwrite(
STDERR,
"清理失败：" .
$exception->getMessage() .
PHP_EOL
);
exit(1);
}
' "$HOST" "$WP_ROOT"
BASH
Make it executable:
chmod 700 /root/bin/w3tc-flush-host-object-cache
If a similar issue affects the English Host in the future, run:
/root/bin/w3tc-flush-host-object-cache \
en.shuijingwanwq.com
If the primary domain is affected, run:
/root/bin/w3tc-flush-host-object-cache \
www.shuijingwanwq.com
The purpose of this script is not to delete the cache for a single page. It is to:
Bootstrap WordPress under a specified Host and invoke the Object Cache flush method provided by the current W3 Total Cache environment.
13. This Script Should Not Be Run Routinely
It is important to clarify that this is not a command to run after every post is published.
It is better suited to cases where:
后台已经保存新代码或新配置
数据库中的数据已经更新
www Host 已经读取到新内容
en Host 仍然读取旧内容
后台“清除所有缓存”没有效果
直接访问源站时仍然可以复现
If an ordinary page has not updated, check the following layers first:
浏览器缓存
Cloudflare 或 EdgeOne 缓存
W3TC Page Cache
页面是否真正回源
Only consider running this script after confirming that WordPress on the origin is loading inconsistent object states under different Hosts.
It is also inadvisable to run the following without first confirming the scope of impact:
redis-cli FLUSHALL
or:
redis-cli FLUSHDB
These methods flush a broader scope of data, making it harder to determine whether other data in the same Redis instance will be affected.
14. Remember to Remove the Temporary Debug Response Header
After resolving the issue, remove the temporary debug code from the WPCode snippet:
add_action(
'send_headers',
function () {
header(
'X-SWQ-Calendar-V3-Loaded: yes'
);
},
999
);
The debug response header was used only to confirm:
www 是否加载了 V3
en 是否加载了 V3
There is no reason to keep it after the issue has been confirmed.
After deleting and saving it, if the English Host still outputs the old debug response header, run the following again:
/root/bin/w3tc-flush-host-object-cache \
en.shuijingwanwq.com
15. The Complete Chain of Causes
This incident was not caused by a single issue, but by two overlapping layers.
Layer 1: The Old Code Was Incompatible with the New Language-Domain Structure
The original WPCode snippet was written for:
https://www.shuijingwanwq.com/en/
英文站to:
https://en.shuijingwanwq.com/
the old code continued to force the following prefix:
$home_url . $current_lang . '/'
It therefore appended a complete English-subdomain URL to /en/ again.
Layer 2: The New Code Did Not Reach the English Host Immediately
Even after the code had been upgraded to a multi-domain-compatible V3, the English Host continued to run the old version.
The test results were:
www Host：已加载 V3
en Host：未加载 V3
After flushing W3TC Object Cache under the English Host, the result changed to:
www Host：已加载 V3
en Host：已加载 V3
错误链接数量：0
A more precise conclusion is therefore:
The malformed calendar links were initially generated by old WPCode logic that was incompatible with the subdomain-based language setup. After the corrected code was saved, a stale W3TC Object Cache state in the current multi-Host environment was not invalidated promptly, causing the English site to continue running the old code.
16. Conclusion
This investigation ultimately established three key points.
First, a complete absolute URL returned by WordPress or Polylang should not be processed with simple string replacement and /en/ concatenation.
In environments that support language directories, subdomains, or separate domains, URLs should be rebuilt from the actual homepage configured for the current language.
Second, with Polylang multi-domain mode, W3 Total Cache Object Cache, and Redis, a successful save in the dashboard does not necessarily mean that every Host has loaded the same updated object.
In this environment, at least, I observed:
www 已更新
en 仍然读取旧版本
Third, when “Purge All Caches” in the dashboard has no effect, repeatedly clicking the same button is not a useful troubleshooting strategy.
A more effective approach is to verify each layer in sequence:
浏览器
CDN
源站 Page Cache
WordPress 实时输出
不同 Host 是否加载相同代码
For now, I have a reusable preliminary solution:
/root/bin/w3tc-flush-host-object-cache \
en.shuijingwanwq.com
It does not yet explain why W3TC produced different code-loading states across Hosts in this environment. It does, however, mean that the next occurrence will not require repeating the entire investigation or flushing the whole Redis database.
For this site, that is already a controlled and verifiable response—and a more explicit one than repeatedly clicking “Purge All Caches” in the dashboard.
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我是拥有 15+ 年经验的 PHP / Go 后端工程师，长期关注已有系统维护、Bug 修复、性能优化、服务器排查、WordPress 网站维护和小功能迭代。
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