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我有一个基岩 wordpress 站点，composer 托管在 platform.sh 上，我已经在服务器上安装了 redis，但是 wordpress 不使用的对象缓存有问题，监控 wordpress 错误截图。

Redis 以及 PHP 扩展都很好地安装在服务器上。

platform ssh  'php -m'
[PHP Modules]
bcmath
bz2
calendar
Core
ctype
curl
date
dba
dom
exif
fileinfo
filter
ftp
gd
gettext
hash
iconv
igbinary
intl
json
libxml
mbstring
mysqli
mysqlnd
openssl
pcntl
pcre
PDO
pdo_mysql
pdo_sqlite
Phar
posix
redis <--
Reflection
session
SimpleXML
soap
sockets
SPL
sqlite3
standard
sysvmsg
sysvsem
sysvshm
tokenizer
xml
xmlreader
xmlwriter
Zend OPcache
zip
zlib

[Zend Modules]
Zend OPcache

Connection to ssh.fr-3.platform.sh closed.

我使用插件WP REDIS

配置 wp redis

$_SERVER['CACHE_HOST']        = 'redis.internal';
$_SERVER['CACHE_PORT']        = 6379;
$_SERVER['CACHE_PASSWORD']    = '';
$_SERVER['WP_CACHE_KEY_SALT'] = env('WP_SITEURL'); // salt to prevent collisions of cached data between different sites
$_SERVER['CACHE_DB']          = 0;

测试OK

web@app.0:~/web/wp/wp-content$ wp redis cli
redis.internal:6379> ping
PONG

object-cache.php 文件位于 wp-content 文件夹中

web@app.0:~$ cd web/wp/wp-content/
web@app.0:~/web/wp/wp-content$ ls
cache  index.php  object-cache.php  plugins  themes

测试监视器

web@app.0:~$ wp redis cli
redis.internal:6379> flushall
OK
redis.internal:6379> monitor
OK

我刷新主页，它不起作用

我的插件安装

web@app.0:~/web/wp/wp-content$ wp plugin list
+------------------------------------------------+----------+-----------+---------+
| name                                           | status   | update    | version |
+------------------------------------------------+----------+-----------+---------+
| acf-custom-fields                              | active   | none      | 5.11.4  |
| automate-woo                                   | active   | none      | 5.5.7   |
| cache-control                                  | active   | none      | 2.2.5   |
| cmp-coming-soon-maintenance                    | active   | none      | 4.0.19  |
| contact-form-7                                 | active   | none      | 5.5.3   |
| disable-cart-fragments                         | active   | none      | 2.0     |
| enhancer-woocommerce-subscription              | active   | none      | 2.9     |
| jetpack                                        | active   | none      | 10.5    |
| query-monitor                                  | active   | none      | 3.8.2   |
| sendcloud-shipping                             | active   | none      | 2.1.1   |
| woocommerce-sendinblue-newsletter-subscription | active   | none      | 2.0.33  |
| woocommerce                                    | active   | available | 5.9.0   |
| woocommerce-payments                           | active   | none      | 3.5.0   |
| woocommerce-pdf-invoices-packing-slips         | active   | none      | 2.11.4  |
| load-templates                                 | active   | none      | 1.0     |
| woocommerce-subscription                       | active   | none      | 3.1.6   |
| wp-mail-smtp                                   | active   | none      | 3.2.1   |
| wp-redis                                       | active   | none      | 1.1.4   |
| wordpress-seo                                  | active   | none      | 17.9    |
| bedrock-autoloader                             | must-use | none      | 1.0.3   |
| disallow-indexing                              | must-use | none      | 1.0.0   |
| register-theme-directory                       | must-use | none      | 1.0.0   |
+------------------------------------------------+----------+-----------+---------+

编辑：当我使用 wp redis info 时，我收到错误 WP Redis object-cache.php file is missing from the wp-content/ directory，但 object-cache.php 文件在 wp-content 中。

web@app.0:~/web/wp/wp-content$ wp redis info
Error: WP Redis object-cache.php file is missing from the wp-content/ directory.

wp-redis/cli.php

  *     $ wp redis info
  *     +-------------------+-----------+
  *     | Field             | Value     |
  *     +-------------------+-----------+
  *     | status            | connected |
  *     | used_memory       | 529.25K   |
  *     | uptime            | 0 days    |
  *     | key_count         | 20        |
  *     | instantaneous_ops | 9/sec     |
  *     | lifetime_hitrate  | 53.42%    |
  *     | redis_host        | 127.0.0.1 |
  *     | redis_port        | 6379      |
  *     | redis_auth        |           |
  *     | redis_database    | 0         |
  *     +-------------------+-----------+
  *
  *     $ wp redis info --field=used_memory
  *     529.38K
  *
  *     $ wp redis info --reset
  *     Success: Redis stats reset.
  */
 public function info($_, $assoc_args)
 {
     global $wp_object_cache, $redis_server;
     if (!defined('WP_REDIS_OBJECT_CACHE') || !WP_REDIS_OBJECT_CACHE) {
         WP_CLI::error('WP Redis object-cache.php file is missing from the wp-content/ directory.');
     }
     if ($wp_object_cache->is_redis_connected && WP_CLI\Utils\get_flag_value($assoc_args, 'reset')) {
         // Redis::resetStat() isn't functional, see https://github.com/phpredis/phpredis/issues/928
         if ($wp_object_cache->redis->eval("return redis.call('CONFIG','RESETSTAT')")) {
             WP_CLI::success('Redis stats reset.');
         } else {
             WP_CLI::error("Couldn't reset Redis stats.");
         }
     } else {
         $data = wp_redis_get_info();
         if (is_wp_error($data)) {
             WP_CLI::error($data);
         }
         $formatter = new \WP_CLI\Formatter($assoc_args, array_keys($data));
         $formatter->display_item($data);
     }
 }

wp-content/object-cache.php

web@app.0:~/web/wp/wp-content$ cat object-cache.php 
<?php

// WP Redis
// This file needs to be symlinked or copied to wp-content/object-cache.php

// Users with setups where multiple installs share a common wp-config.php or $table_prefix
// can use this to guarantee uniqueness for the keys generated by this object cache.
if ( ! defined( 'WP_CACHE_KEY_SALT' ) ) {
    define( 'WP_CACHE_KEY_SALT', '' );
}

if ( ! defined( 'WP_REDIS_OBJECT_CACHE' ) ) {
    define( 'WP_REDIS_OBJECT_CACHE', true );
}

if ( ! defined( 'WP_REDIS_USE_CACHE_GROUPS' ) ) {
    define( 'WP_REDIS_USE_CACHE_GROUPS', false );
}

if ( ! defined( 'WP_REDIS_DEFAULT_EXPIRE_SECONDS' ) ) {
    define( 'WP_REDIS_DEFAULT_EXPIRE_SECONDS', 0 );
}

if ( ! defined( 'WP_REDIS_IGNORE_GLOBAL_GROUPS' ) ) {
    define( 'WP_REDIS_IGNORE_GLOBAL_GROUPS', false );
}

WP_REDIS_OBJECT_CACHE 变量应该在 object-cache.php 文件中设置但它没有执行，为什么 wordpress 不执行该文件？

我指定它是具有只读访问权限的服务器。

已解决，object-cache.php 文件必须放在 web/app/ 的根目录下，而不是放在 web/wp/wp-content 文件夹中。

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