Adds a top-level menu page.

Adds a submenu page to the Settings main menu.

Add a URL to those already pinged.

Adds a meta field to the given post.

Retrieves a modified URL query string.

Adds a submenu page.

Checks if a user is logged in, if not it redirects them to the login page.

Get number of days since the start of the week.

Display the link to the comments.

Determines whether the current post is open for comments.