list.php 파일에 아래의 코드를 적절히 수정해보세요.

<?php if(kboard_keyword()):?>
<?php
	global $wpdb;
	$search_keyword = kboard_keyword();
	$result = $wpdb->get_results("SELECT DISTINCT `category1` FROM `{$wpdb->prefix}kboard_board_content` WHERE `board_id` = '{$board->id}' AND (`title` LIKE '%{$search_keyword}%' OR `content` LIKE '%{$search_keyword}%')");
?>

<?php foreach($result as $value):?>
	<label><input type="checkbox"><span><?php echo $value->category1?></span></label>
<?php endforeach?>
<?php endif?>

고맙습니다.