is_single()

is_single() — Determines whether the query is for an existing single post. Works for any post type, except attachments and pages If the $post parameter is specified, this function will additionally check if the query is for one of the Posts specified. For more information on this and similar theme functions, check out the {

Inputs: $post (int|string|int[]|string[]): Optional. Post ID, title, slug, or array of such to check against. Default empty.

Returns bool: Whether the query is for an existing single post.