Formerly used to escape strings before inserting into the DB.

This deprecated function formerly set the site_name property of the $current_site object.

Retrieves the closest matching network for a domain and path.

Retrieves the value of a query variable in the WP_Query class.

Retrieves the closest matching site object by its domain and path.

Retrieve the description for the HTTP status.

Retrieves the full permalink for the current post or post ID.

Retrieves list of WordPress theme features (aka theme tags).

Check if an image size exists.

Performs autosave with heartbeat.