Using WordPress ‘is_protected_meta()’ PHP function
Learn how to use the in WordPress to determine if a meta key is protected
Comments
Using WordPress ‘get_the_comments_navigation()’ PHP function
Retrieves navigation to next/previous set of comments, when applicable.
Using WordPress ‘make_url_footnote()’ PHP function
Strip HTML and put links at the bottom of stripped content.
Using WordPress ‘register_meta()’ PHP function
Learn how to use the WordPress'register_meta()' function to register custom meta keys for your website