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wp_installing( bool $is_installing = null ): bool

Check or set whether WordPress is in “installation” mode.

Description

If the WP_INSTALLING constant is defined during the bootstrap, wp_installing() will default to true.

Parameters

$is_installing bool Optional
True to set WP into Installing mode, false to turn Installing mode off.
Omit this parameter if you only want to fetch the current status.

Default: null

Return

bool True if WP is installing, otherwise false. When a $is_installing is passed, the function will report whether WP was in installing mode prior to the change to $is_installing.

Source

File: wp-includes/load.php. View all references

function wp_installing( $is_installing = null ) {
	static $installing = null;

	// Support for the `WP_INSTALLING` constant, defined before WP is loaded.
	if ( is_null( $installing ) ) {
		$installing = defined( 'WP_INSTALLING' ) && WP_INSTALLING;
	}

	if ( ! is_null( $is_installing ) ) {
		$old_installing = $installing;
		$installing     = $is_installing;
		return (bool) $old_installing;
	}

	return (bool) $installing;
}

Used By

Used By Description
_wp_theme_json_webfonts_handler() wp-includes/script-loader.php

Runs the theme.json webfonts handler.
wp_schedule_update_user_counts() wp-includes/user.php

Schedules a recurring recalculation of the total count of users.
wp_schedule_https_detection() wp-includes/https-detection.php

Schedules the Cron hook for detecting HTTPS support.
wp_update_https_migration_required() wp-includes/https-migration.php

Updates the ‘https_migration_required’ option if needed when the given URL has been updated from HTTP to HTTPS.
filter_default_metadata() wp-includes/meta.php

Filters into default_{$object_type}_metadata and adds in default value.
wp_is_maintenance_mode() wp-includes/load.php

Check if maintenance mode is enabled.
WP_Site_Health::maybe_create_scheduled_event() wp-admin/includes/class-wp-site-health.php

Creates a weekly cron event, if one does not already exist.
WP_Recovery_Mode::initialize() wp-includes/class-wp-recovery-mode.php

Initialize recovery mode for the current request.
wp_get_active_and_valid_themes() wp-includes/load.php

Retrieves an array of active and valid themes.
wp_initialize_site() wp-includes/ms-site.php

Runs the initialization routine for a given site.
wp_default_packages_inline_scripts() wp-includes/script-loader.php

Adds inline scripts required for the WordPress JavaScript packages.
wp_schedule_delete_old_privacy_export_files() wp-includes/functions.php

Schedules a WP_Cron job to delete expired export files.
ms_load_current_site_and_network() wp-includes/ms-load.php

Identifies the network and site of a requested domain and path and populates the corresponding network and site global objects as part of the multisite bootstrap process.
wp_get_available_translations() wp-admin/includes/translation-install.php

Get available translations from the WordPress.org API.
WP_Automatic_Updater::is_disabled() wp-admin/includes/class-wp-automatic-updater.php

Determines whether the entire automatic updater is disabled.
update_home_siteurl() wp-admin/includes/misc.php

Flushes rewrite rules if siteurl, home or page_on_front changed.
request_filesystem_credentials() wp-admin/includes/file.php

Displays a form to the user to request for their FTP/SSH details in order to connect to the filesystem.
validate_current_theme() wp-includes/theme.php

Checks that the active theme has the required files.
load_default_textdomain() wp-includes/l10n.php

Loads default translated strings based on locale.
get_locale() wp-includes/l10n.php

Retrieves the current locale.
wp_not_installed() wp-includes/load.php

Redirect to the installer if WordPress is not installed.
wp_get_active_and_valid_plugins() wp-includes/load.php

Retrieve an array of active and valid plugin files.
dead_db() wp-includes/functions.php

Loads custom DB error or display WordPress DB error.
is_blog_installed() wp-includes/functions.php

Determines whether WordPress is already installed.
wp_schedule_update_checks() wp-includes/update.php

Schedules core, theme, and plugin update checks.
wp_version_check() wp-includes/update.php

Checks WordPress version against the newest version.
wp_update_plugins() wp-includes/update.php

Checks for available updates to plugins based on the latest versions hosted on WordPress.org.
wp_update_themes() wp-includes/update.php

Checks for available updates to themes based on the latest versions hosted on WordPress.org.
set_site_transient() wp-includes/option.php

Sets/updates the value of a site transient.
delete_site_transient() wp-includes/option.php

Deletes a site transient.
get_site_transient() wp-includes/option.php

Retrieves the value of a site transient.
get_transient() wp-includes/option.php

Retrieves the value of a transient.
set_transient() wp-includes/option.php

Sets/updates the value of a transient.
wp_load_alloptions() wp-includes/option.php

Loads and caches all autoloaded options, if available or all options.
wp_load_core_site_options() wp-includes/option.php

Loads and caches certain often requested site options if is_multisite() and a persistent cache is not being used.
update_option() wp-includes/option.php

Updates the value of an option that was already added.
add_option() wp-includes/option.php

Adds a new option.
delete_option() wp-includes/option.php

Removes option by name. Prevents removal of protected WordPress options.
delete_transient() wp-includes/option.php

Deletes a transient.
get_option() wp-includes/option.php

Retrieves an option value based on an option name.
wp_schedule_update_network_counts() wp-includes/ms-functions.php

Schedules update of the network-wide counts for the current network.
wpmu_create_blog() wp-includes/ms-functions.php

Creates a site.
wp_style_loader_src() wp-includes/script-loader.php

Administration Screen CSS for changing the styles.
script_concat_settings() wp-includes/script-loader.php

Determines the concatenation and compression settings for scripts and styles.
wp_default_scripts() wp-includes/script-loader.php

Registers all WordPress scripts.

Changelog

Version Description
4.4.0 Introduced.

© 2003–2022 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/wp_installing