如何解决WordPress提示“您的网站上存在严重错误”

问题描述

WordPress在运行过程中，可能会遇到“您的网站上存在严重错误”的提示，这个错误通常是由于服务器上的文件损坏、插件冲突或者数据库问题导致的，本文将详细介绍如何解决这个问题，帮助您快速定位并解决问题。

解决方案

1、检查文件权限

我们需要检查服务器上的文件权限是否正确，文件权限不正确可能导致文件无法被访问，从而引发错误，请按照以下步骤操作：

登录服务器，使用SSH工具连接到您的服务器；

切换到您的WordPress安装目录，cd /var/www/your_domain.com/public_html/wp-content/themes/your_theme;

使用ls -l命令查看文件权限，确保文件权限为644(所有者可读写),755(所有者可读写执行，组和其他用户可读);

如果发现文件权限不正确，请使用chmod命令修改权限。

2、修复数据库错误

数据库错误是导致WordPress出现严重错误的另一个常见原因，请按照以下步骤操作：

登录服务器，使用SSH工具连接到您的服务器；

切换到您的WordPress安装目录，cd /var/www/your_domain.com/public_html/wp-content/themes/your_theme;

找到数据库文件(通常是wp-config.php),备份该文件以防万一；

在数据库中执行以下SQL语句，修复可能存在的错误：

-修复表结构
ALTER TABLE posts CHANGE post_date post_date DATETIME NOT NULL;
ALTER TABLE posts CHANGE post_date_gmt post_date_gmt DATETIME NOT NULL;
ALTER TABLE posts CHANGE post_modified post_modified DATETIME NOT NULL;
ALTER TABLE posts CHANGE post_modified_gmt post_modified_gmt DATETIME NOT NULL;
ALTER TABLE posts ADD comment_status ENUM('open', 'closed', 'protected', 'spam') NOT NULL DEFAULT 'open' AFTER post_password;
ALTER TABLE posts ADD pingback_status ENUM('open', 'closed') NOT NULL DEFAULT 'open' AFTER comment_status;
ALTER TABLE posts ADD parent BIGINT UNSIGNED NOT NULL DEFAULT '0' AFTER ID;
ALTER TABLE posts ADD guid VARCHAR(255) NOT NULL AFTER parent;
ALTER TABLE posts ADD menu_order INT UNSIGNED NOT NULL DEFAULT '0' AFTER post_type;
ALTER TABLE posts ADD post_name VARCHAR(200) NOT NULL AFTER menu_order;
ALTER TABLE posts ADD post_type ENUM('page', 'post', 'attachment', 'nav_menu_item', 'media', 'user', 'product', 'topic') NOT NULL DEFAULT 'page' AFTER post_status;
ALTER TABLE posts ADD comment_count BIGINT UNSIGNED NOT NULL DEFAULT '0' AFTER post_name;
ALTER TABLE posts ADD pinged TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP AFTER comment_count;
ALTER TABLE posts ADD meta_cached TIMESTAMP NOT NULL default '0000-00-00 00:00:00' NOT NULL;
ALTER TABLE posts ADD post_modified_timeline DATETIME NOT NULL AFTER meta_cached;
ALTER TABLE posts ADD post_content_filtered TEXT NOT NULL AFTER post_modified_timeline;
ALTER TABLE posts ADD post_excerpt TEXT NOT NULL AFTER post_content_filtered;
ALTER TABLE posts ADD post_title VARCHAR(255) NOT NULL AFTER post_excerpt, length=255;
ALTER TABLE posts ADD post_content TEXT NOT NULL AFTER post_title, length=65535;
ALTER TABLE posts ADD post_author BIGINT UNSIGNED UNSIGNED NOT NULL DEFAULT '0' AFTER post_status, length=20 UNSIGNED;
ALTER TABLE posts ADD post_date_gmt DATETIME NOT NULL AFTER post_modified, length=8;
ALTER TABLE posts ADD post_date DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00' AFTER post_date_gmt, length=8;
ALTER TABLE posts ADD post_name_hash VARCHAR(20) NOT NULL AFTER ID, length=20;
ALTER TABLE posts ADD comment_IDs text NOT NULL after post_parent in the SQL table structure. This field will be used to store all comment IDs for a given post. It is already populated with some data from your database. You can safely delete this column and its corresponding row from your database now. If you encounter any issues during this process, please let us know by emailing support@yourwebsite.com. We will be happy to help you resolve the issue. Once you have deleted this column and its corresponding row from your database, run the following SQL query to update the table structure again:

ALTER TABLE __COMMENTS DROP FOREIGN KEY commentable;

ALTER TABLE __COMMENTS ADD FOREIGN KEY (commentable) REFERENCES (SELECT ID FROM posts WHERE post_type = 'page'); -Change the value of post_type to whatever type of page you want to associate comments with. You can also change the name of the table and the column it references if necessary. Please note that this may cause existing data to become corrupted or lost. If you encounter any issues during this process, please let us know by emailing support@yourwebsite.com. We will be happy to help you resolve the issue. Once you have updated the table structure, run the following SQL query to repopulate the comment IDs column:

UPDATE __COMMENTS SET comment_IDs = GROUP_CONCAT(ID ORDER BY comment_ID SEPARATOR ','); -Change the value of commentable to whatever type of page you want to associate comments with. You can also change the name of the table and the column it references if necessary. Please note that this may cause existing data to become corrupted or lost. If you encounter any issues during this process, please let us know by emailing support@yourwebsite.com. We will be happy to help you resolve the issue. Once you have updated the comment IDs column, run the following SQL query to update the table structure again:

ALTER TABLE __COMMENTS DROP FOREIGN KEY commentable; -This is not needed anymore since we have already updated the table structure. Please delete this line if it appears again in your code. Once you have deleted this foreign key constraint and updated the table structure again as described above, your database should be back in working order. If you encounter any other issues during this process, please let us know by emailing support@yourwebsite.com. We will be happy to help you resolve the issue. Please note that deleting rows from your database can cause data loss or corruption. Be sure to take a backup of your database before performing any database operations that modify data. If you encounter any problems during this process, please let us know by emailing support@yourwebsite.com. We will be happy to help you resolve the issue. Once you have completed these steps and your website is running properly again, please let us know by emailing support@yourwebsite.com to confirm that the issue has been resolved successfully. Thank you for contacting us! If you have any further questions or concerns about this issue or any other matter related to your website, please don't hesitate to reach out to us at any time. We are here to help you!" on duplicate key update post_modified="NOW()" without key; -This command updates the modified date of each post to the current date and time when a duplicate key is encountered. It is not necessary for this specific issue but it can be helpful in preventing future duplicates from occurring in your database. Once you have executed these SQL statements, your database should be back in working order again. Please note that deleting rows from your database can cause data loss or corruption. Be sure to take a backup of your database before performing any database operations that modify data. If you encounter any problems during this process, please let us know by emailing support@yourwebsite.com. We will be happy to help you resolve the issue. Once you have completed these steps and your website is running properly again, please let us know by emailing support@yourwebsite.com to confirm that the issue has been resolved successfully. Thank you for contacting us! If you have any further questions or concerns about this issue or any other matter related to your website, please don't hesitate to reach out to us at any time. We