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<?php
namespace MediaWiki\Hook;
use Wikimedia\Rdbms\IReadableDatabase;
/**
* This is a hook handler interface, see docs/Hooks.md.
* Use the hook name "DeleteUnknownPreferences" to register handlers implementing this interface.
*
* @stable to implement
* @ingroup Hooks
*/
interface DeleteUnknownPreferencesHook {
/**
* This hook is called by the cleanupPreferences.php maintenance script
* to build a WHERE clause with which to delete preferences that are not
* known about. This hook is used by extensions that have dynamically-named
* preferences that should not be deleted in the usual cleanup process.
* For example, the Gadgets extension creates preferences prefixed with
* 'gadget-', so anything with that prefix is excluded from the deletion.
*
* @since 1.35
*
* @param array &$where Array that will be passed as the $cond parameter to
* IReadableDatabase::select() to determine what will be deleted from the user_properties
* table
* @param IReadableDatabase $db IReadableDatabase object,
* useful for accessing $db->expr() to build expressions with IExpression::LIKE and LikeValue
* @return bool|void True or no return value to continue or false to abort
*/
public function onDeleteUnknownPreferences( &$where, $db );
}