子サイトの一覧を持って来るクラス

gistfile1.php

class Child_Blog {

	public $count = 3;

	public $list_page = 0;

	public function set_list_page(){
		if($this->list_page){
			return $this->list_page;
		}
		else {
				global $post;
				return $post->ID;
		}

		return 0;

	}

	public function get_blog_ids( $paged = 1 ) {
		global $wpdb;

		if($paged < 1) {
			$paged = 1;
		}

		$sql = "SELECT blog_id FROM wp_blogs WHERE public = '1' AND blog_id != '1' ORDER BY last_updated DESC LIMIT ".$this->count*($paged-1).", ".$this->count ;
		return $wpdb->get_results( $wpdb->prepare( $sql ) );
	}


	function previous_list_link() {
		$paged = get_query_var('paged');

		if($paged < 3){
			return get_permalink($this->set_list_page());
		}

		$previouspaged = $paged - 1;
		return get_permalink($this->set_list_page())."page/".$previouspaged;

	}

	function the_previous_link(){
		if($this->previous_list_link()){
			?>
			<a href="<?php echo $this->previous_list_link();?>">前のページ</a>
			<?php
		}
	}

	function next_list_link() {
		global $wpdb,$post;
		$paged = get_query_var('paged');

		if($paged < 1) {
			$paged = 1;
		}

		$sql = "SELECT blog_id FROM wp_blogs WHERE public = '1' AND blog_id != '1' ORDER BY last_updated DESC LIMIT ".$this->count*($paged).", ".$this->count ;
		$next = $wpdb->get_results( $wpdb->prepare( $sql ) );

		if(empty( $next )) {
			return false;

		} else {
			$nextpaged = $paged + 1;
			return get_permalink($this->set_list_page())."page/".$nextpaged;
		}
	}

	function the_next_link(){
		if($this->next_list_link()){
			?>
			<a href="<?php echo $this->next_list_link();?>">次のページ</a>
			<?php
		}
	}


}

HOW to Use

<?php
$child_blog = new Child_Blog();
$child_blog->count= 5;//5サイトずつ持って来る。デフォルトは3つ。

$blogs = $child_blog->get_blog_ids(get_query_var('paged'));

foreach ($blogs as $key => $blog) {

  if($blog->blog_id != 1) {
    switch_to_blog( $blog->blog_id );
    
    //この中でget_posts()するなり、WP_Queryするなり。get_option()するなり。
  }
}

<?php $child_blog->the_previous_link();//前のページへ?>
<?php $child_blog->the_next_link();//次のページへ?>