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is_plugin_active( string $plugin )

Determines whether a plugin is active.

Description

Only plugins installed in the plugins/ folder can be active.

Plugins in the mu-plugins/ folder can’t be "activated," so this function will return false for those plugins.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

Parameters

$plugin

(string) (Required) Path to the plugin file relative to the plugins directory.

Return

(bool) True, if in the active plugins list. False, not in the list.

Source

File: wp-admin/includes/plugin.php 

function is_plugin_active( $plugin ) {
	return in_array( $plugin, (array) get_option( 'active_plugins', array() ), true ) || is_plugin_active_for_network( $plugin );
}

Uses

Uses Description
wp-admin/includes/plugin.php: is_plugin_active_for_network()

Determines whether the plugin is active for the entire network.
wp-includes/option.php: get_option()

Retrieves an option value based on an option name.

Used By

Used By Description
wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php: WP_REST_Plugins_Controller::get_plugin_status()

Get’s the activation status for a plugin.
wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php: WP_REST_Plugins_Controller::check_read_permission()

Checks if the given plugin can be viewed by the current user.
wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php: WP_REST_Plugins_Controller::delete_item()

Deletes one plugin from the site.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::active_before()

Turns on maintenance mode before attempting to background update an active plugin.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::active_after()

Turns off maintenance mode after upgrading an active plugin.
wp-admin/includes/class-wp-debug-data.php: WP_Debug_Data::debug_data()

Static function for generating site debug data when required.
wp-admin/includes/class-wp-site-health.php: WP_Site_Health::get_test_plugin_version()

Test if plugins are outdated, or unnecessary.
wp-admin/includes/plugin.php: is_plugin_paused()

Determines whether a plugin is technically active but was paused while loading.
wp-admin/press-this.php: wp_load_press_this()
wp-admin/includes/ajax-actions.php: wp_ajax_delete_plugin()

Ajax handler for deleting a plugin.
wp-includes/deprecated.php: wp_ajax_press_this_add_category()

Ajax handler for creating new category from Press This.
wp-includes/deprecated.php: wp_ajax_press_this_save_post()

Ajax handler for saving a post from Press This.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::bulk_upgrade()

Bulk upgrade several plugins at once.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::deactivate_plugin_before_upgrade()

Deactivates a plugin before it is upgraded.
wp-admin/includes/class-wp-plugins-list-table.php: WP_Plugins_List_Table::single_row()
wp-admin/includes/class-wp-plugins-list-table.php: WP_Plugins_List_Table::prepare_items()
wp-admin/includes/class-plugin-installer-skin.php: Plugin_Installer_Skin::after()

Action to perform following a plugin install.
wp-admin/includes/class-plugin-upgrader-skin.php: Plugin_Upgrader_Skin::__construct()

Constructor.
wp-admin/includes/update.php: wp_plugin_update_row()

Displays update information for a plugin.
wp-admin/includes/plugin.php: is_plugin_inactive()

Determines whether the plugin is inactive.
wp-admin/includes/plugin.php: deactivate_plugins()

Deactivate a single plugin or multiple plugins.
wp-admin/includes/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::display_rows()

Changelog

Version Description
2.5.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/is_plugin_active