wp_dropdown_cats

wp_dropdown_cats: 这个函数类似于wp_dropdown_categories，但它是用来在编辑文章的表单中显示文章类别的下拉菜单。

用于生成类别下拉控件的Legacy函数。

function wp_dropdown_cats( $current_cat = 0, $current_parent = 0, $category_parent = 0, $level = 0, $categories = 0 ) {
	_deprecated_function( __FUNCTION__, '3.0.0', 'wp_dropdown_categories()' );
	if (!$categories )
		$categories = get_categories( array('hide_empty' => 0) );

	if ( $categories ) {
		foreach ( $categories as $category ) {
			if ( $current_cat != $category->term_id && $category_parent == $category->parent) {
				$pad = str_repeat( '– ', $level );
				$category->name = esc_html( $category->name );
				echo "nt<option value='$category->term_id'";
				if ( $current_parent == $category->term_id )
					echo " selected='selected'";
				echo ">$pad$category->name</option>";
				wp_dropdown_cats( $current_cat, $current_parent, $category->term_id, $level +1, $categories );
			}
		}
	} else {
		return false;
	}
}