WordPress at a glance
function is not described

allow_subdirectory_install() WP 3.0.0

Allow subdirectory installation.

  • Global. wpdb. $wpdb WordPress database abstraction object.
Hooks in function
Return

true/false. Whether subdirectory installation is allowed

Usage

allow_subdirectory_install();

Code of allow subdirectory install: wp-admin/includes/network.php VER 5.1.1

<?php
function allow_subdirectory_install() {
	global $wpdb;
		/**
		 * Filters whether to enable the subdirectory installation feature in Multisite.
		 *
		 * @since 3.0.0
		 *
		 * @param bool $allow Whether to enable the subdirectory installation feature in Multisite. Default is false.
		 */
	if ( apply_filters( 'allow_subdirectory_install', false ) ) {
		return true;
	}

	if ( defined( 'ALLOW_SUBDIRECTORY_INSTALL' ) && ALLOW_SUBDIRECTORY_INSTALL ) {
		return true;
	}

	$post = $wpdb->get_row( "SELECT ID FROM $wpdb->posts WHERE post_date < DATE_SUB(NOW(), INTERVAL 1 MONTH) AND post_status = 'publish'" );
	if ( empty( $post ) ) {
		return true;
	}

	return false;
}