Using WordPress ‘admin_page_access_denied’ PHP action
The 'admin_page_access_denied' PHP action in WordPress restricts access to admin pages based on user roles or capabilities.
PHP
Using WordPress ‘admin_post_thumbnail_html’ PHP filter
The 'admin_post_thumbnail_html' PHP filter allows developers to customize the HTML output of the post thumbnail box in the WordPress admin panel.
Using WordPress ‘admin_print_styles-media-upload-popup’ PHP action
The 'admin_print_styles-media-upload-popup' PHP action in WordPress allows developers to add custom styles to the media upload popup window.
Using WordPress ‘admin_xml_ns’ PHP action
The 'admin_xml_ns' PHP action hook in WordPress allows developers to add custom XML namespaces to the admin area.