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How to fix database connection errors in WordPress

When encountering WordPress database connection errors, the most common reason is that the database cannot be accessed normally. You can troubleshoot through the following steps: 1. Check whether the database name, user name, password and DB_HOST in the wp-config.php file are correct, especially if the host is replaced or the settings may not be updated; 2. Confirm whether the database service is running normally, check the database status through the control panel, phpMyAdmin or the command line; 3. Clear the cache and check plug-in conflicts, clear all types of caches and disable plug-ins to check one by one; 4. Check whether the database is corrupt, and try to repair the table structure using phpMyAdmin or the built-in repair function of the system.

Aug 11, 2025 pm 02:53 PM

Database connection error

How to debug REST API requests

To debug RESTAPI requests, you must first confirm whether the request structure is correct, including URL, HTTP methods, Headers and Body. 1. Check whether the URL is complete and accurate to avoid 404 due to spelling errors; 2. Use the correct HTTP method to prevent 405 from returning due to mismatch of methods; 3. Check the Headers content, such as Content-Type and Authorization; 4. Ensure that the Body data format is consistent with the interface requirements. Then use the debugging tool to analyze the request details, such as the browser developer tool to view the network panel, or the Postman and curl manual test interfaces, and use the packet capture tool to analyze the HTTPS request content if necessary. Then judge the problem based on the response status code

Aug 11, 2025 pm 01:18 PM

How to set up a staging environment for WordPress

TosetupaWordPressstagingenvironment,useyourhostingprovider’sbuilt-instagingtoolforspeedandsimplicity.1.CheckyourhostingdashboardorcPanelfora“Staging”sectionandcloneyourlivesitewithoneclick.2.Alternatively,usepluginslikeWPStaging,Duplicator,orAll-in-O

Aug 11, 2025 pm 01:13 PM

How to change the WordPress memory limit

WordPress insufficient memory error can be resolved by adjusting memory limits. 1. Modify the wp-config.php file and add define ('WP_MEMORY_LIMIT','256M') to increase the memory limit. Ordinary sites can be set to 128M or 256M, and e-commerce or multiple author sites can be 512M; 2. If it does not take effect, it may be a server restriction, you can try to edit php.ini to set memory_limit=256M or contact the host manufacturer for assistance; 3. Use plug-ins such as WPMemoryUsage or HealthCheck&Troubleshooting to view the current memory usage and assist in troubleshooting. Improve memory

Aug 11, 2025 am 11:45 AM

How to manage user sessions

To manage user sessions, you need to select appropriate mechanisms based on the application scenario and pay attention to security and life cycle control. 1. Use server-side Session security cookies to be suitable for traditional web applications, and ensure security through unique SessionID and Cookie attributes; 2. Token-based authentication such as JWT is more suitable for front-end and back-end separation architectures, with stateless and cross-domain advantages but requires blacklist cooperation; 3. A reasonable expiration time, active destruction mechanism and RefreshToken strategy should be set to control the session life cycle; 4. Multi-device login requires a maximum number of devices, and a login reminder and forced logout function to take into account both experience and security.

Aug 08, 2025 am 05:44 AM

How to revert plugin update

If you encounter problems after the plug-in is updated, you can roll back to the old version to resolve. There are three specific methods: First, check whether there is automatic backup. If you use UpdraftPlus, BackupBuddy and other plug-ins to backup, you can find the backup record before update in the background and restore the plug-in files; second, manually replace the old version through FTP, download the old version installation package and decompress it, use the FTP tool to log in to the server and enter the /wp-content/plugins/ directory to replace the file, and reactivate the plug-in; third, use special plug-ins such as "WPRollback" for version control, and select the historical version in the background to downgrade with one click, but not all plug-ins support this method. Which method to choose depends on whether you have backup habits and operation preferences.

Aug 08, 2025 am 04:12 AM

plug-in Version rollback

How to fix error establishing a database connection

When encountering "ErrorEstablishingaDatabaseConnection", first check whether the database configuration information is correct, including the user name, password, database name and host address; secondly confirm whether the database service is running normally, and restart the service if necessary; then check whether the database is damaged or the permission settings problem, and repair it; finally consider server resources or restrictions, such as connection number, memory or firewall settings. 1. Check whether the database username, password and host information are correct, and you can confirm the accurate information through the control panel; 2. Confirm whether the database service is running, use commands to view the status and try to restart; 3. Check whether the database is corrupt or insufficient permissions, use tools to repair the table or enable Wor

Aug 08, 2025 am 02:24 AM

How to use filter hooks in WordPress

Filter hook is a tool in WordPress for modifying data. It is different from action, focusing on processing and returning modified data. Register the callback function to a specific filter through the add_filter() function, such as the_content, and adjust the article content, etc. Common application scenarios include: 1. Modify navigation menu items; 2. Adjust search results; 3. Control the summary length; 4. Replace the template path. Best practices should be followed when using: do not directly modify the original data, set priority reasonably, avoid duplicate hooks, and use has_filter() to check for conflicts. Mastering filter can enhance code flexibility and maintainability.

Aug 08, 2025 am 12:37 AM

How to use namespaces in WordPress plugins

NamespacesinWordPresspluginsshouldbeusedtoavoidfunctionandclassnameconflicts.Theyhelporganizecode,especiallyasprojectsgroworintegratethird-partylibraries,bygroupingrelatedelementsunderauniqueidentifier,suchasyourpluginorcompanyname.Todefineanamespace

Aug 07, 2025 pm 04:13 PM

How to exclude categories from the loop

There are three ways to exclude specific categories in WordPress: use query_posts(), use the pre_get_posts hook, or use the plug-in. First, use query_posts() to directly modify the main loop query in the template file, such as query_posts(array('category__not_in'=>array(3,5))), which is suitable for temporary adjustment but may affect paging; second, it is safer to add functions in functions.php through the pre_get_posts hook. For example, excluding the specified classification ID when judging the home page main loop, it will not affect other page logic; finally, WPCate can be used

Aug 07, 2025 am 08:45 AM

排除分類(lèi)

How to use security keys and salts in wp-configphp

The security key and salt value are random strings used by WordPress to encrypt user sessions and enhance password security. It includes eight values: AUTH_KEY, SECURE_AUTH_KEY, LOGGED_IN_KEY, NONCE_KEY, AUTH_SALT, SECURE_AUTH_SALT, LOGGED_IN_SALT, NONCE_SALT; their function is to provide additional randomness and encryption strength for sensitive information. It is recommended to obtain strong random strings to replace the default value through the official generator https://api.wordpress.org/secret-key/1.1/salt/ to avoid using examples or simple words.

Aug 07, 2025 am 06:29 AM

安全密鑰 Salts

How to configure Apache for WordPress

To enable Apache to run WordPress, you need to complete the following steps: 1. Enable the mod_rewrite and headers modules, use a2enmod and restart Apache; 2. Create a virtual host configuration file, set DocumentRoot and directory permissions, and ensure that AllowOverrideAll is supported to support .htaccess; 3. Configure the .htaccess file to achieve a permalink, ensure that the file exists and the permissions are correct, and Apache users have write permissions. After the above steps are completed, WordPress can run stably on Apache.

Aug 07, 2025 am 03:32 AM

How to add custom items to the Admin Bar

To add custom links to WordPressAdminBar, 1. Use the admin_bar_menu hook to register the menu item, and set the id, title, href and meta parameters through the add_node method; 2. You can add icons in meta with the Dashicons icon library, and use wp_enqueue_style to load the icon library if necessary; 3. Use current_user_can to control the display permissions of the menu item; 4. Use parent parameters to organize the hierarchical relationship between the main menu and the submenu.

Aug 06, 2025 am 06:46 AM

How to modify the main WordPress query

To modify WordPress main query, it is recommended to use the pre_get_posts hook to adjust query conditions. For example, check is_home() and is_main_query() to ensure that only the main query of the homepage is affected; avoid using query_posts() to avoid breaking pagination; for advanced filtering, you can use parse_query hook; if you need to add extra loops to the template, you should use WP_Query or get_posts() and use wp_reset_postdata() to reset the global variables. 1. Use pre_get_posts to modify the main query; 2. Avoid query_posts(); 3. Use parse_q

Aug 06, 2025 am 04:26 AM