Function: Displays the viewport meta in the admin.

Function: Adds viewport meta for mobile in Customizer.

Function: Checks if the user needs to update PHP.

Function: Add 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Function: Appends ‘(Draft)’ to draft page titles in the privacy page dropdown so that unpublished content is obvious.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: Send a referrer policy header so referrers are not sent externally from administration screens.

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

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

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

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

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

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

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

Function: Autosave with heartbeat

Function:

Function: Check lock status for posts displayed on the Posts screen

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

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

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

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

Function: Check 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.

Function: Delete WordPress rewrite rule from web.config file if it exists there

Function: Updates the IIS web.config file with the current rules if it is writable.