Function: Adds viewport meta for mobile in Customizer.

Function: Displays the viewport meta in the admin.

Function: Checks if the user needs to update PHP.

Function: Adds the latest Heartbeat and REST-API nonce to the Heartbeat response.

Function: Appends ‘(Draft)’ to draft page titles in the privacy page dropdown so that unpublished content is obvious.

Function: Sends a referrer policy header so referrers are not sent externally from administration screens.

Function: Outputs the formatted file list for the plugin file editor.

Function: Makes a tree structure for the theme file editor’s file list.

Function: Outputs the formatted file list for the theme file editor.

Function: Makes a tree structure for the plugin file editor’s file list.

Function: Outputs JS that reloads the page if the user navigated to it with the Back or Forward button.

Function: Removes single-use URL parameters and create canonical link based on new URL.

Function: Sends a confirmation request email when a change of site admin email address is attempted.

Function: Checks nonce expiration on the New/Edit Post screen and refresh if needed.

Function: Disables suspension of Heartbeat on the Add/Edit Post screens.

Function: Performs autosave with heartbeat.

Function: Checks lock status for posts displayed on the Posts screen.

Function: Checks lock status on the New/Edit Post screen and refresh the lock.

Function: Saves option for number of rows when listing posts, pages, comments, etc.

Function: Inserts an array of strings into a file (.htaccess), placing it between BEGIN and END markers.

Function: Checks if rewrite rule for WordPress already exists in the IIS 7+ configuration file.

Function: Updates the htaccess file with the current rules if it is writable.