The "attachment_icon" PHP filter in WordPress allows developers to modify the default icon displayed for file attachments. This can be useful for improving user experience and branding.

The 'added_existing_user' PHP action in WordPress triggers specific actions when a user is added who already exists in the database.

​The article provides information on how to use the `admin_bar_init` WordPress PHP action to modify or add items to the admin bar. It includes examples such as adding a custom…

The 'admin_footer_text' PHP filter in WordPress allows developers to customize the footer text displayed in the admin panel.

​The `allowed_http_origin` WordPress filter modifies the allowed HTTP origin by returning the origin URL if allowed, or an empty string if not

​The `allowed_http_origins` WordPress filter controls the set of allowed HTTP origins, allowing you to secure your site with custom rules

The 'atom_enclosure' PHP filter in WordPress allows developers to manipulate and customize the enclosure tag in Atom feeds. With this filter, you can modify the enclosure URL, length, type, and…

​The `atom_head` WordPress action allows you to modify the header information of an Atom feed, including adding a custom logo, stylesheet, favicon, and custom feed information. This article provides examples…

The 'admin_head-{$hook_suffix}' action in WordPress allows developers to customize the head section of admin pages with CSS or JavaScript.