Find the post ID for redirecting an old date.

Find the post ID for redirecting an old slug.

Generates post data.

Retrieves the currently queried object.

Retrieves the ID of the currently queried object.

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

Determines whether current WordPress query has comments to loop over.

Determines whether current WordPress query has posts to loop over.

Determines whether the caller is in the Loop.

Determines whether the query has resulted in a 404 (returns no results).