is_plugin_active( string $plugin )

Check 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.

Parameters

$plugin

(string) (Required) Path to the main plugin file from 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() ) ) || is_plugin_active_for_network( $plugin );
}

Expand Source Code View on GitHub

Related

Uses

Uses
Uses Description
wp-includes/option.php: get_option()

Retrieves an option value based on an option name.
wp-admin/includes/plugin.php: is_plugin_active_for_network()

Check whether the plugin is active for the entire network.

Used By

Used By
Used By Description
wp-includes/deprecated.php: wp_ajax_press_this_save_post()

Ajax handler for saving a post from Press This.
wp-includes/deprecated.php: wp_ajax_press_this_add_category()

Ajax handler for creating new category from Press This.
wp-admin/press-this.php: wp_load_press_this()
wp-admin/includes/class-wp-plugins-list-table.php: WP_Plugins_List_Table::prepare_items()
wp-admin/includes/class-wp-plugins-list-table.php: WP_Plugins_List_Table::single_row()
wp-admin/includes/ajax-actions.php: wp_ajax_delete_plugin()

Ajax handler for deleting a plugin.
wp-admin/includes/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::display_rows()
wp-admin/includes/class-plugin-upgrader-skin.php: Plugin_Upgrader_Skin::__construct()
wp-admin/includes/plugin.php: deactivate_plugins()

Deactivate a single plugin or multiple plugins.
wp-admin/includes/plugin.php: is_plugin_inactive()

Check whether the plugin is inactive.
wp-admin/includes/update.php: wp_plugin_update_row()

Displays update information for a plugin.
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.
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Changelog

Changelog
Version Description
WP-2.5.0 Introduced.