WP_Theme::is_allowed( string $check = 'both', int $blog_id = null ): bool

1557	public function is_allowed( $check = 'both', $blog_id = null ) {1558		if ( ! is_multisite() ) {1559			return true;1560		}1561 1562		if ( 'both' === $check || 'network' === $check ) {1563			$allowed = self::get_allowed_on_network();1564			if ( ! empty( $allowed[ $this->get_stylesheet() ] ) ) {1565				return true;1566			}1567		}1568 1569		if ( 'both' === $check || 'site' === $check ) {1570			$allowed = self::get_allowed_on_site( $blog_id );1571			if ( ! empty( $allowed[ $this->get_stylesheet() ] ) ) {1572				return true;1573			}1574		}1575 1576		return false;1577	}