WP_Font_Library::register_font_collection( string $slug, array $args ): WP_Font_Collection|WP_Error

46	public function register_font_collection( string $slug, array $args ) {47		$new_collection = new WP_Font_Collection( $slug, $args );48 49		if ( $this->is_collection_registered( $new_collection->slug ) ) {50			$error_message = sprintf(51				/* translators: %s: Font collection slug. */52				__( 'Font collection with slug: "%s" is already registered.' ),53				$new_collection->slug54			);55			_doing_it_wrong(56				__METHOD__,57				$error_message,58				'6.5.0'59			);60			return new WP_Error( 'font_collection_registration_error', $error_message );61		}62		$this->collections[ $new_collection->slug ] = $new_collection;63		return $new_collection;64	}