全てのキー
<?php wp_dropdown_categories( $args ); ?>
<?php $args = array(
'show_option_all' => '',
'show_option_none' => '',
'option_none_value' => '-1',
'orderby' => 'ID',
'order' => 'ASC',
'show_count' => '0',
'hide_empty' => '0',
'child_of' => '0',
'exclude_tree' => '',
'exclude' => '',
'include' => '',
'echo' => '0',
'selected' => '0',
'hierarchical' => '1',
'title_li' => '',
'current_category' => '',
'name' => 'cat',
'pad_counts' => '0',
'id' => 'name',
'class' => 'postform',
'depth' => '-1',
'tab_index' => '0',
'taxonomy' => 'category',
'hide_if_enpty' => '0',
'value_field' => 'term_id',
'style' => 'none'
'use_desc_for_title' => '0',
'feed' => '',
'feed_image' => '',
'number' => 'null',
); ?>
よく使うキー
<?php wp_dropdown_categories( $args ); ?>
<?php $args = array(
'show_option_all' => '',
'orderby' => 'ID',
'order' => 'ASC',
'show_count' => '0',
'exclude' => '',
'include' => '',
'title_li' => '',
'depth' => '-1',
'style' => 'none'
); ?>