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Technical Articles

CMS Tutorial

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

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

How to register a custom field for the REST API

To add custom fields to WordPress's RESTAPI, use register_rest_field() or register_meta(). 1. Use register_rest_field() to process custom data that is not metadata, register fields through rest_api_init hook, and define get_callback, update_callback and permission control; 2. Use register_meta() to expose fields stored in postmeta or usermeta, just set show_in_rest to true; 3. Access the REST of the site when testing new fields

Aug 06, 2025 am 04:18 AM

How to customize the admin footer text

TochangetheWordPressadminfootertext,editthetheme’sfunctions.phpfileoruseaplugin.1.Openfunctions.phpandadd:functioncustom_admin_footer(){echo'Yourcustomtext';}add_filter('admin_footer_text','custom_admin_footer');replacingtheechotextasdesired.2.Option

Aug 06, 2025 am 02:14 AM

How to optimize WordPress database performance

When WordPress databases run slowly, you can improve performance by regularly cleaning up junk data, optimizing table structure and indexing, enabling caching mechanisms, and adjusting database server configuration. 1. Regularly clean up spam data, such as article revisions, drafts, spam comments, etc. You can use plug-ins or manually execute SQL statements to delete it. It is recommended to once a month. 2. Optimize the database table structure and index, add indexes to high-frequency query fields (such as wp_postmeta's meta_key) to improve query efficiency, but avoid excessive indexing affecting write performance. 3. Enable the cache mechanism, such as object cache (Redis/Memcached) or use the cache plug-in (W3TotalCache/WPSuperCache), and cooperate with C

Aug 05, 2025 am 06:51 AM

Database optimization

How to display custom user fields

To realize the display of custom user fields on forums, CMS or user management platforms, the following steps must be followed: 1. Confirm whether the platform supports custom user fields. For example, WordPress can be implemented through plug-ins, Discourse through background settings, and Django through custom models; 2. Add fields and configure display permissions, such as setting field types and visibility in WordPress to ensure that privacy data is only authorized to view by users; 3. Call field values in front-end templates, such as using PHP function get_user_meta() or Django template syntax {{user.profile.city}}; 4. Test the field display effect, verify the access permissions of different roles, and the mobile terminal

Aug 05, 2025 am 06:43 AM

How to register custom REST API endpoints

Use the register_rest_route() function to register a custom RESTAPI endpoint, and you need to specify the namespace, route, callback function, method and permission control. The steps include: 1. Use register_rest_route() to set parameters; 2. Write a callback function to process the request and return WP_REST_Response or WP_Error; 3. Configure permission verification and parameter verification; 4. Check hook mount, syntax errors and cache problems during debugging.

Aug 05, 2025 am 06:18 AM

How to protect wp-admin with password

There are three ways to protect the WordPress backend: 1. Use .htpasswd and .htaccess to add server-layer passwords. By creating encrypted credential files and configuring access control, you cannot enter even if you know the login address and account number; 2. Change the default login address and use plug-ins such as WPSHideLogin to customize the login URL to reduce the risk of being automated attacks; 3. In combination with the IP whitelist restricting access sources, set to allow only specific IPs to access wp-login.php in the server configuration to prevent login attempts at unauthorized locations.

Aug 05, 2025 am 04:04 AM

How to implement passwordless login

Passwordless login verifies identity through non-password methods. Common solutions include SMS verification code, email link, TOTP, biometrics, etc. The core is to confirm the user's identity in a safer and more convenient way, such as logging in with verification code or clicking on the email link to complete the login. Scenarios need to be considered when choosing: SMS is suitable for the public but has the risk of interception, email is suitable for the web, TOTP is highly secure and suitable for sensitive systems, FIDO2 has the strongest security but has a high technical threshold. Developers need to pay attention to clear user identification, strong verification code random short time, secure storage of tokens, support multi-factor authentication and set up fallback mechanisms. For example, the email login process is: enter the email address → generate a link with token → send an email → click the link → server verification token → create a session

Aug 04, 2025 am 02:40 AM

How to migrate a WordPress database manually

ManualWordPressdatabasemigrationinvolvesfourkeysteps:First,exportyourcurrentdatabaseusingphpMyAdminormysqldumpviaSSH.Second,updateURLsandserializeddataintheexported.sqlfiletoreflectthenewdomainorenvironment.Third,importthemodifiedSQLfileintothenewdat

Aug 04, 2025 am 02:35 AM

How to create custom Walker classes for menus

Custom Walker class can fully control the WordPress menu output structure. 1. Create a new class that inherits Walker_Nav_Menu; 2. Rewrite start_el(), start_lvl() and other methods to customize the HTML structure; 3. Specify custom class instances through the walker parameter in wp_nav_menu() to achieve high customization of menu styles and functions.

Aug 04, 2025 am 02:00 AM