This WordPress PHP script automatically sets a featured image in a post if it forgets to set one.
Downloads a URL to a local temporary file using the WordPress HTTP API.
Retrieves path of attachment template in current or parent template.
Learn how to use the in WordPress to retrieve the path of an attachment
Retrieves path of page template in current or parent template.
Retrieves path of front page template in current or parent template.
Learn how to use the WordPress 'get_theme_root()' PHP function, which retrieves the path to the themes directory without a trailing slash, with this informative article and its examples
Gets the header images uploaded for the active theme.
Handles a side-loaded file in the same way as an uploaded file is handled by media_handle_upload() .