Wordpress、カテゴリスラッグからobject_idとtitleを求める
$nav = array();
$target_slugs = array('slug1','slug2','slug3','slug4','slug5','slug6');
foreach($target_slugs as $target_slug) {
$target = get_category_by_slug($target_slug);
array_push($nav,
(object) array(
'object_id' => $target->term_id,
'title' => $target->name
)
);
}