WP_DROPDOWN_CATEGORES()搜索不适用于CPT，请检查我的代码

搜索无法使用具有自定义分类的CPT

<form id="searchform" method="get" action="<?php bloginfo(\'url\'); ?>">
        <input type="text" name="s" id="s" size="15" />
        <?php //wp_dropdown_categories(\'show_option_none=Select category&taxonomy=type\'); ?>
        <?php wp_dropdown_categories(\'depth=0&orderby=name&hide_empty=1&show_option_all=Search Everything&name=course&taxonomy=type\'); ?>
        <input type="submit" value="Search" />
    </form>

但对于默认的post和category，则使用此代码

<form id="searchform" method="get" action="<?php bloginfo(\'url\'); ?>">
    <input type="text" name="s" id="s" size="15" />
    <?php //wp_dropdown_categories(\'show_option_none=Select category&taxonomy=type\'); ?>
    <?php wp_dropdown_categories(\'depth=0&orderby=name&hide_empty=1&show_option_all=Search Everything\'); ?>
    <input type="submit" value="Search" />

<?php $categories = get_categories(\'taxonomy=custom-tax\'); $select = "<select name=\'cat\' id=\'cat\' class=\'postform\'>n"; $select.= "<option value=\'-1\'>Select category</option>n"; foreach($categories as $category){ if($category->count > 0){ $select.= "<option value=\'".$category->slug."\'>".$category->name."</option>"; } } $select.= "</select>"; echo $select; ?> <script type="text/javascript"></script>

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