is_plugin_active() – Determines whether a plugin is active.

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Determines whether a plugin is active.

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 {@link Conditional Tags} article in the Theme Developer Handbook.


$bool = is_plugin_active( $plugin );


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


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


File name: wordpress/wp-admin/includes/plugin.php

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

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