備忘録
get_post_custom_keys()の
パラメータに記事IDを指定すれば、
特定の記事のカスタムフィールドの値のリストを取得できます。
filename
get_post_custom_values($key, $post->ID);
//"page-mainImage"という名前だったら
get_post_custom_values("page-mainImage", $post->ID);
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