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Editing: class-lp-question-cache.php
<?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(); } }
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