我正在一个 WordPress 多站点网络上运行 WP-Discourse 插件。网络中的两个站点使用它为两个不同的 Discourse 站点进行 SSO。其他网络站点不使用该插件。它在 2.4.6 版本之前运行正常，但在此之后会导致整个网络出现严重错误。在 2.4.7 更新失败后，我等到下一个版本再次尝试，但问题相同。
该网络运行 WordPress 5.4.1 和 PHP 5.6.40。我提到这一点是因为我知道两者都已过时，但我们有不能升级的原因。
我需要怎么做才能解决这个问题？感谢任何指导或提示。
你能详细说明一下那个错误吗？
EOL 超过 4 年了……
有吗？通常这意味着和至少一个被放弃的自定义插件一样。那么你真正的问题不是 WP-Discourse、过时的损坏 PHP 版本或泄露的 WordPress — 你应该尽快修复你使用过时版本的原因。
我的意思是，我对此并不感到自豪，但多站点网络中存在一些无法更新的主题，并且在我们尝试更新 WordPress 或 PHP 时会导致问题。就我所知，我们非多站点的网站都保持最新，只有多站点是一团糟……
我不得不快速恢复插件的 2.4.6 版本来修复网站，所以我没有太多细节。我会看看是否能短暂地重现问题并开启日志记录。
以下是所有相关的错误和警告：
[06-Jan-2023 18:11:10 UTC] PHP Fatal error: Call to undefined function register_block_type_from_metadata() in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/blocks/comments/comments.php on line 46
[06-Jan-2023 18:11:10 UTC] PHP Fatal error: Call to undefined function register_block_type_from_metadata() in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/blocks/comments/comments.php on line 46
[06-Jan-2023 18:11:12 UTC] PHP Fatal error: Call to undefined function register_block_type_from_metadata() in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/blocks/comments/comments.php on line 46
[06-Jan-2023 18:11:12 UTC] PHP Fatal error: Call to undefined function register_block_type_from_metadata() in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/blocks/comments/comments.php on line 46
[06-Jan-2023 18:11:14 UTC] PHP Fatal error: Call to undefined function register_block_type_from_metadata() in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/blocks/comments/comments.php on line 46
[06-Jan-2023 18:11:32 UTC] PHP Fatal error: Class 'WPDiscourse\\DiscourseComment\\DiscourseComment' not found in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/wp-discourse.php on line 70
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:32 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
[06-Jan-2023 18:11:33 UTC] PHP Warning: Missing argument 2 for WPDiscourse\\Logs\\Logger::create(), called in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/discourse-base.php on line 62 and defined in /var/www/vhosts/groups.ismrm.org/httpdocs/wp-content/plugins/wp-discourse/lib/logs/logger.php on line 37
我什么都不知道，但我曾在 WordPress 上遇到过非常类似的错误，当时 PHP 版本太旧（或者有时太新，那也会有问题）。
该函数是在 Wordpress 5.5.0 中引入的，所以问题就在这里。Wordpress 5.5 已经有 2.5 年多的历史了。您真的应该解决阻碍您升级的“原因”并升级 Wordpress（和 PHP）。
要么是插件，要么是 Wordpress 主题会出问题，而这个主题是无法在当前 Wordpress 上运行的。所以直说吧，这是主题的问题，而不是 WP Discourse 插件的问题。
如果真是这样，并且没有打算像以前那样向后兼容，那么WP-Discourse 插件页面就需要更新为“需要 WordPress 版本：5.5 或更高版本”。它目前显示的是“4.7 或更高版本”。
我不知道你使用的是什么WordPress主题，但有时（我经历过），让主题兼容PHP 7+只需几行代码即可修复。