* @return void
	 */
	public function query_quiz_questions() {

		// Grab the search term if it exists.
		$term = array_key_exists( 'term', $_REQUEST ) ? llms_filter_input_sanitize_string( INPUT_POST, 'term' ) : '';
		$page = array_key_exists( 'page', $_REQUEST ) ? llms_filter_input( INPUT_POST, 'page', FILTER_SANITIZE_NUMBER_INT ) : 0;

		global $wpdb;

		$limit = 30;
		$start = $limit * $page;

		if ( $term ) {
			$like = " AND post_title LIKE '%s'";
			$vars = array( '%' . $term . '%', $start, $limit );
		} else {
			$like = '';
			$vars = array( $start, $limit );
		}

		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared

		$questions = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT ID, post_title
			 FROM $wpdb->posts
			 WHERE
			 	    post_type = 'llms_question'
			 	AND post_status = 'publish'
			 	$like
			 ORDER BY post_title
			 LIMIT %d, %d
			",
				$vars
			)
		);

		// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared

		$r = array();
		foreach ( $questions as $q ) {

			$r[] = array(
				'id'   => $q->ID,
				'name' => $q->post_title . ' (' . $q->ID . ')',
			);

		}

		echo json_encode(
			array(
				'items'   => $r,
				'more'    => count( $r ) === $limit,
				'success' => true,
			)
		);

		wp_die();