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<?php
/**
* Class LP_Quiz_Cache
*
* @author tungnx
* @since 4.2.0
* @version 1.0.0
*/
defined( 'ABSPATH' ) || exit();
class LP_Question_Cache extends LP_Cache {
/**
* @var null|LP_Question_Cache
*/
protected static $instance;
/**
* @var string
*/
protected $key_group_child = 'question';
/**
* Get instance
*
* @return self
*/
public static function instance(): self {
if ( is_null( self::$instance ) ) {
self::$instance = new self();
}
return self::$instance;
}
public function __construct() {
parent::__construct();
}
}