wordpressのcanonicalの設定
https://on-ze.com/archives/1576
<?php if (is_home()) { $canonical_url = get_bloginfo('url'); } elseif (is_category()) { $canonical_url=get_category_link(get_query_var('cat')); } elseif (is_page() || is_single()) { $canonical_url = get_permalink(); } if ( $paged >= 2 || $page >= 2) { $canonical_url = $canonical_url.'page/'.max( $paged, $page ).'/'; } elseif(is_404()) { $canonical_url = get_bloginfo('url')."/404"; } else { $canonical_url = get_bloginfo('url'); } ?> <link rel="canonical" href="<?php echo $canonical_url; ?>">