Retrieves the URL of a file in the theme.

Expands a theme’s starter content configuration using core-provided data.

Retrieve URLs that need to be pinged.

Retrieves the locale of a user.

Checks whether a custom header is set or not.

Checks whether a header video is set or not.

Checks whether the custom header video is eligible to show on the current page.

Whether switch_to_locale() is in effect.

Determines whether the current post uses a page template.

Prints out option HTML elements for the page templates drop-down.