我需要帮助分离子页面，这是我现在拥有的：

<ul class="children">
    <li class="page_item page-item-54 page_item_has_children"><span>Title of Child1</span>
    <ul class="children">
        <li class="page_item page-item-60"><a>Grandchild1</a></li>
        <li class="page_item page-item-62"><a>Grandchild2</a></li>
    </ul>
</li>
    <li class="page_item page-item-58 page_item_has_children"><span>Title of Child2</span>
    <ul class="children">
        <li class="page_item page-item-64"><a>Grandchild1</a></li>
        <li class="page_item page-item-66"><a>Grandchild2</a></li>
    </ul>
</li>
</ul>

这就是我想要实现的目标：

<div class="children-list">
    <ul class="children">
        <span>Title of Child1</span>
        <li class="page_item page-item-60"><a>Grandchild1</a></li>
        <li class="page_item page-item-62"><a>Grandchild2</a></li>
    </ul>

    <ul class="children">
        <span>Title of Child2</span>
        <li class="page_item page-item-64"><a>Grandchild1</a></li>
        <li class="page_item page-item-66"><a>Grandchild2</a></li>
    </ul>
</div>

这是我用于wp\\u list\\u页面的助行器

class series_walker extends Walker_Page {
    public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
        if ( isset( $args[\'item_spacing\'] ) && \'preserve\' === $args[\'item_spacing\'] ) {
            $t = "\\t";
            $n = "\\n";
        } else {
            $t = \'\';
            $n = \'\';
        }
        if ( $depth ) {
            $indent = str_repeat( $t, $depth );
        } else {
            $indent = \'\';
        }

        $css_class = array( \'page_item\', \'page-item-\' . $page->ID );

        if ( isset( $args[\'pages_with_children\'][ $page->ID ] ) ) {
            $css_class[] = \'page_item_has_children\';
        }

        if ( ! empty( $current_page ) ) {
            $_current_page = get_post( $current_page );
            if ( $_current_page && in_array( $page->ID, $_current_page->ancestors ) ) {
                $css_class[] = \'current_page_ancestor\';
            }
            if ( $page->ID == $current_page ) {
                $css_class[] = \'current_page_item\';
            } elseif ( $_current_page && $page->ID == $_current_page->post_parent ) {
                $css_class[] = \'current_page_parent\';
            }
        } elseif ( $page->ID == get_option(\'page_for_posts\') ) {
            $css_class[] = \'current_page_parent\';
        }

        $css_classes = implode( \' \', apply_filters( \'page_css_class\', $css_class, $page, $depth, $args, $current_page ) );

        if ( \'\' === $page->post_title ) {
            /* translators: %d: ID of a post */
            $page->post_title = sprintf( __( \'#%d (no title)\' ), $page->ID );
        }

        $args[\'link_before\'] = empty( $args[\'link_before\'] ) ? \'\' : $args[\'link_before\'];
        $args[\'link_after\'] = empty( $args[\'link_after\'] ) ? \'\' : $args[\'link_after\'];

        $atts = array();
        $atts[\'href\'] = get_permalink( $page->ID );

        $output .= $indent . sprintf(
            \'<li class="%s">\'.(($depth == 1) ? \'<span%s>%s%s%s</span>\' : \'<a%s>%s%s%s</a>\'),
            $css_classes,
            $attributes,
            $args[\'link_before\'],
            /** This filter is documented in wp-includes/post-template.php */
            apply_filters( \'the_title\', $page->post_title, $page->ID ),
            $args[\'link_after\']
        );
    }

}

非常感谢您的帮助，我已经尝试了两天了。非常感谢。

$mylist = preg_replace(\'/^\\s*\\<ul[^>]*\\>/is\', \'<div class="children-list">\', $mylist);
$mylist = preg_replace(\'/\\<\\/ul\\>\\s*$/is\', \'</div>\', $mylist);
$mylist = preg_replace(\'/\\<\\/ul\\>\\s*\\<\\/li>/is\', \'</ul>\', $mylist);
$mylist = preg_replace(\'/<li\\b[^>]*has\\_children[^>]*\\>(.*?)(<ul\\b[^>]*\\>)/is\', \'$2$1\', $mylist);

echo $mylist;