WP_Font_Utils::sanitize_font_family( string $font_family ): string

60	public static function sanitize_font_family( $font_family ) {61		if ( ! $font_family ) {62			return '';63		}64 65		$output          = sanitize_text_field( $font_family );66		$formatted_items = array();67		if ( str_contains( $output, ',' ) ) {68			$items = explode( ',', $output );69			foreach ( $items as $item ) {70				$formatted_item = self::maybe_add_quotes( $item );71				if ( ! empty( $formatted_item ) ) {72					$formatted_items[] = $formatted_item;73				}74			}75			return implode( ', ', $formatted_items );76		}77		return self::maybe_add_quotes( $output );78	}