allow_subdirectory_install(): bool

54function allow_subdirectory_install() {55	global $wpdb;56 57	/**58	 * Filters whether to enable the subdirectory installation feature in Multisite.59	 *60	 * @since 3.0.061	 *62	 * @param bool $allow Whether to enable the subdirectory installation feature in Multisite.63	 *                    Default false.64	 */65	if ( apply_filters( 'allow_subdirectory_install', false ) ) {66		return true;67	}68 69	if ( defined( 'ALLOW_SUBDIRECTORY_INSTALL' ) && ALLOW_SUBDIRECTORY_INSTALL ) {70		return true;71	}72 73	$post = $wpdb->get_row( "SELECT ID FROM $wpdb->posts WHERE post_date < DATE_SUB(NOW(), INTERVAL 1 MONTH) AND post_status = 'publish'" );74	if ( empty( $post ) ) {75		return true;76	}77 78	return false;79}