我正在为我正在开发的网站构建一个自定义网站地图，我成功应用自定义过滤器并显示正确页面的唯一方法是创建几个循环，每次检查父级是否有子级，然后相应地显示它们。这是一个相当大的网站，有大量的内容。
这是我当前的循环，它引出了每个页面的标题和链接：
<?php $children = get_posts( array('category' => $region_id, 'post_type' => 'page', 'numberposts' => 100, 'post_parent' => $pg->ID, 'post_status' => 'publish', 'orderby' => 'menu_order', 'order' => 'ASC') ); ?>
<?php if ($children) : ?>
<ul class="children">
<?php foreach ($children as $child) : ?>
<?php $subkids = get_posts( array('category' => $region_id, 'post_type' => 'page', 'numberposts' => 100, 'post_parent' => $child->ID, 'post_status' => 'publish', 'orderby' => 'menu_order', 'order' => 'ASC') ); ?>
<li>
<a href="<?php echo get_permalink($child->ID); ?>" title="<?php echo $child->post_title;?>"><?php echo $child->post_title;?></a>
<?php if( count( $subkids ) != 0 ) : ?>
<ul class="children">
<?php foreach($subkids as $kid) : ?>
<?php $subkids2 = get_posts( array('category' => $region_id, 'post_type' => 'page', 'numberposts' => 100, 'post_parent' => $kid->ID, 'post_status' => 'publish', 'orderby' => 'menu_order', 'order' => 'ASC') ); ?>
<li>
<a href="<?php echo get_permalink($kid->ID); ?>" title="<?php echo $kid->post_title; ?>"><?php echo $kid->post_title; ?></a>
<?php if( count( $subkids2 ) != 0 ) : ?>
<ul class="children">
<?php foreach($subkids2 as $kid2) : ?>
<?php $subkids3 = get_posts( array('category' => $region_id, 'post_type' => 'page', 'numberposts' => 100, 'post_parent' => $kid2->ID, 'post_status' => 'publish', 'orderby' => 'menu_order', 'order' => 'ASC') ); ?>
<li>
<a href="<?php echo get_permalink($kid2->ID); ?>" title="<?php echo $kid2->post_title; ?>"><?php echo $kid2->post_title; ?></a>
<?php if( count( $subkids3 ) != 0 ) : ?>
<ul class="children">
<?php foreach($subkids3 as $kid3) : ?>
<li>
<a href="<?php echo get_permalink($kid3->ID); ?>" title="<?php echo $kid3->post_title; ?>"><?php echo $kid3->post_title; ?></a>
</li>
<?php endforeach; ?>
</ul>
<?php endif; //for if forth level children exist ($subkid3) ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; //for if third level children exist ($subkid2) ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; //for if second level children exist ($subkids) ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
编辑：我从代码中删除了我的自定义元过滤器以减少空间，但这里有一个我在每个循环中应用的示例：
<?php $meta = get_post_meta($child -> ID, 'wpcf-visible-in-sitemap'); ?>
<?php if($meta[0] != 1) : // If page should not be displayed, hide it ?>
<li><a href="<?php echo get_permalink($child -> ID); ?>" alt="<?php echo get_the_title($child -> ID); ?>"><?php echo get_the_title($child -> ID); ?></a></li>
<?php endif; ?>
这看起来真的很恶心，有没有更有效的编码方法？
递归函数已经解决了我的问题，我能够将代码简化为以下内容：
function check_for_children( $region_id, $children ) {
if ( count($children) > 0 ) {
echo '<ul class="children">';
foreach($children as $child) {
echo '<li>' . $child -> post_title . '</li>';
$children = get_posts( array('category' => $region_id, 'post_type' => 'page', 'numberposts' => 100, 'post_parent' => $child -> ID, 'post_status' => 'publish', 'orderby' => 'menu_order', 'order' => 'ASC') );
check_for_children($region_id, $children);
}
echo '</ul>';
} else {
return;
}
}
该函数调用自己，直到不再有和子函数为止，此时它将移动到下一个集合。