[摘要] 新年新气象，有强迫症的人看到有新版本升级就手痒，手欠将所有可升级的插件都升级了一遍，哈哈，终于卡住了，刚升级了2个之后便出现500错误，控制台无法打开，wordpress 日志出现了Call to undefined function bws_general_menu() 这样的错误，看了下前端页面并不受影响，下面是两则wp升级失败的情况以及如何修复。

出问题后，先看了下日志：

2018/01/04 16:23:21 [error] 23301#0: *26030 FastCGI sent in stderr: "PHP message: PHP Fatal error:  
Call to undefined function bws_general_menu() in 
/path/wordpress/wp-content/plugins/relevant/related-posts-plugin.php on line 34
PHP message: PHP Stack trace:
PHP message: PHP   1. {main}() /path/wordpress/wp-admin/index.php:0
PHP message: PHP   2. require_once() /path/wordpress/wp-admin/index.php:10
PHP message: PHP   3. require() /path/wordpress/wp-admin/admin.php:140
PHP message: PHP   4. require_once() /path/wordpress/wp-admin/menu.php:286
PHP message: PHP   5. do_action() /path/wordpress/wp-admin/includes/menu.php:149
PHP message: PHP   6. WP_Hook->do_action() /path/wordpress/wp-includes/plugin.php:453
PHP message: PHP   7. WP_Hook->apply_filters() /path/wordpress/wp-includes/class-wp-hook.php:310
PHP message: PHP   8. call_user_func_array:{/path/wordpress/wp-includes/class-wp-hook.php:286}() 
/path/wordpress/wp-includes/class-wp-hook.php:286
PHP message: PHP   9. add_rltdpstsplgn_admin_menu() /path/wordpress/wp-includes/class-wp-hook.php:286" 
while reading response header from upstream, client: 172.68.133.199, server: sudops.com, 
request: "GET /wp-admin/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", 
host: "www.sudops.com", referrer: "https://www.sudops.com/"

查了下bws_general_menu报错的地方，是出现在relevant这样一个插件。

# grep -r bws_general_menu *
wp-content/plugins/relevant/bws_menu/bws_functions.php:		bws_general_menu();
wp-content/plugins/relevant/bws_menu/bws_functions.php:if ( ! function_exists ( 'bws_general_menu' ) ) {
wp-content/plugins/relevant/bws_menu/bws_functions.php:	function bws_general_menu() {
wp-content/plugins/relevant/bws_menu/bws_functions.php:		global $menu, $bws_general_menu_exist;
wp-content/plugins/relevant/bws_menu/bws_functions.php:		if ( ! $bws_general_menu_exist ) {
wp-content/plugins/relevant/bws_menu/bws_functions.php:			
/* we check also menu exist in global array as in old plugins $bws_general_menu_exist variable not exist */
wp-content/plugins/relevant/bws_menu/bws_functions.php:					$bws_general_menu_exist = true;
wp-content/plugins/relevant/bws_menu/bws_functions.php:			$bws_general_menu_exist = true;
wp-content/plugins/relevant/related-posts-plugin.php:		bws_general_menu();

这样就好办了，最简单的办法就是进入到wp-content/plugins/目录，将有问题的插件移走，然后刷新 wordpress 页面即可。这个办法同样适用于 wordpress 的模板，如果因为某个模板导致页面无法打开也可以将模板删除或者移走，这方法百试不爽！

前两天升级的时候也出现了一次正在例行维护，请一分钟后回来的提示

解决方法是进入到发布目录，找到 .maintenance 文件，将其删除即可。