# is_subdomain_install()

URL: https://chugunov.pro/api-wordpress/functions/is_subdomain_install/
Проверено на WordPress 6.9, обновлено 06.08.2026.
Источник: независимый русскоязычный справочник chugunov.pro. Не является официальной документацией WordPress.

Тип: функция.
Появился в версии: 3.0.0.

## Сигнатура

```php
is_subdomain_install(): bool
```

## Описание

Включена ли конфигурация с поддоменами.

## Возвращаемое значение

`bool`

## Исходный код

Файл: `wp-includes/ms-load.php:18`

```php
function is_subdomain_install() {
	if ( defined( 'SUBDOMAIN_INSTALL' ) ) {
		return SUBDOMAIN_INSTALL;
	}

	return ( defined( 'VHOST' ) && 'yes' === VHOST );
}
```

## История изменений

- 3.0.0 — Introduced.

## Связанные

Используется в: [`wp_initialize_site`](https://chugunov.pro/api-wordpress/functions/wp_initialize_site/), [`get_oembed_response_data_for_url`](https://chugunov.pro/api-wordpress/functions/get_oembed_response_data_for_url/), [`show_blog_form`](https://chugunov.pro/api-wordpress/functions/show_blog_form/), [`network_step2`](https://chugunov.pro/api-wordpress/functions/network_step2/), [`avoid_blog_page_permalink_collision`](https://chugunov.pro/api-wordpress/functions/avoid_blog_page_permalink_collision/), `WP_MS_Sites_List_Table::prepare_items`, `WP_MS_Sites_List_Table::get_sortable_columns`, [`install_blog`](https://chugunov.pro/api-wordpress/functions/install_blog/), [`wpmu_validate_blog_signup`](https://chugunov.pro/api-wordpress/functions/wpmu_validate_blog_signup/), [`wpmu_signup_blog_notification`](https://chugunov.pro/api-wordpress/functions/wpmu_signup_blog_notification/), [`get_blogaddress_by_domain`](https://chugunov.pro/api-wordpress/functions/get_blogaddress_by_domain/), [`get_blogaddress_by_name`](https://chugunov.pro/api-wordpress/functions/get_blogaddress_by_name/), [`get_id_from_blogname`](https://chugunov.pro/api-wordpress/functions/get_id_from_blogname/), [`get_blog_details`](https://chugunov.pro/api-wordpress/functions/get_blog_details/), [`ms_cookie_constants`](https://chugunov.pro/api-wordpress/functions/ms_cookie_constants/).

Оригинал в официальной документации: https://developer.wordpress.org/reference/functions/is_subdomain_install/