您可以通过首先使用数据库查询来计算已经使用该模板的页面数来实现此目的：

$query = "SELECT COUNT(*) as total
    FROM prefix_posts as p JOIN prefix_postmeta as m ON p.ID = m.post_id
    WHERE p.\'post_type\' = \'page\'
    AND p.\'post_status\' = \'publish\'
    AND m.\'meta_key\'    = \'_wp_page_template\'
    AND m.\'meta_value\'  = \'page-your-template-name.php\'";