渲染元数据

get_post_meta(
    int $post_id,
    string $key = '',
    bool $single = false
);

$wporg_meta_value = get_post_meta(get_the_ID(), 'wporg_meta_key');

get_post_custom(
    int $post_id
);

$meta_array = get_post_custom(get_the_ID());