[code]
extend 폴더에 board.php 파일을 만드신 후

<?php
$skin_href = "./board.php?bo_table=".$bo_table;
if($skin_path){
 set_cookie("skin", $skin_path, 86400);
    $board_skin_path = get_skin_path('board', $skin_path);
 $board_skin_url = get_skin_url('board', $skin_path);
}else{
 $skin_path = get_cookie("skin");
    if($skin_path){
        $board_skin_path = get_skin_path('board', $skin_path);
        $board_skin_url = get_skin_url('board', $skin_path);
 }
}
?>

스킨 list.skin.php 에서

<?php if ($rss_href || $write_href) { ?>
        <ul class="btn_bo_user">
            <?php if ($rss_href) { ?><li><a href="<?php echo $rss_href ?>" class="btn_b01 btn"><i class="fa fa-rss" aria-hidden="true"></i> RSS</a></li><?php } ?>
            <?php if ($admin_href) { ?><li><a href="<?php echo $admin_href ?>" class="btn_admin btn"><i class="fa fa-user-circle" aria-hidden="true"></i> 관리자</a></li><?php } ?>
            <?php if ($write_href) { ?><li><a href="<?php echo $write_href ?>" class="btn_b02 btn"><i class="fa fa-pencil" aria-hidden="true"></i>  글쓰기</a></li><?php } ?>
        </ul>
        <?php } ?>

아래 처럼 변경

<?php if ($rss_href || $write_href) { ?>
        <ul class="btn_bo_user">
                                    <li><a href="<?php echo $skin_href?>&skin_path=theme/basic" class="btn_b01 btn"><i class="fa fa-list" aria-hidden="true"></i> 리스트</a></li>
                                                <li><a href="<?php echo $skin_href?>&skin_path=theme/gallery" class="btn_b01 btn"><i class="fa fa-photo" aria-hidden="true"></i> 갤러리</a></li>
            <?php if ($rss_href) { ?><li><a href="<?php echo $rss_href ?>" class="btn_b01 btn"><i class="fa fa-rss" aria-hidden="true"></i> RSS</a></li><?php } ?>
            <?php if ($admin_href) { ?><li><a href="<?php echo $admin_href ?>" class="btn_admin btn"><i class="fa fa-user-circle" aria-hidden="true"></i> 관리자</a></li><?php } ?>
            <?php if ($write_href) { ?><li><a href="<?php echo $write_href ?>" class="btn_b02 btn"><i class="fa fa-pencil" aria-hidden="true"></i>  글쓰기</a></li><?php } ?>
        </ul>
        <?php } ?>

[/code]

사용방법
사용 하시고 싶은 스킨을 따로 입력하시면 전환됩니다.

<?php echo $skin_href?>&skin_path=theme/basic
<?php echo $skin_href?>&skin_path=baisc