関数リファレンス/get categories
単純に表示するなら、
<?php
$args = array(
// 'order' => 'ASC', //昇順
// 'orderby' => 'count' //投稿数でソート とかオプション記述
);
$categories = get_categories($args);
foreach ($categories as $category) {
echo '<a id="cat-' . $category->term_id . '-url" title="'
. esc_html($category->cat_name) . 'の投稿一覧へ" href="'
. get_category_link($category->term_id) . '" >'
. esc_html($category->cat_name)
. ' (' . $category->category_count . ')</a>';
}
?>
<?php $categories = get_categories( $args ); ?> <?php $args = array( 'type' => 'post', 'child_of' => 0, 'parent' => '', 'orderby' => 'name', 'order' => 'ASC', 'hide_empty' => 1, 'hierarchical' => 1, 'exclude' => '', 'include' => '', 'number' => '', 'taxonomy' => 'category', 'pad_counts' => false ); ?>