我正在将类别下拉列表添加到我的主题选项页面。我正在这样尝试：

<p>
            Select a style from the list
            <?php
            $amp_categories_obj = get_categories(\'hide_empty=0\');
   $amp_categories = array();
   foreach ($amp_categories_obj as $amp_cat) {
   $amp_categories[$amp_cat->cat_ID] = $amp_cat->category_nicename;
   }
   $categories_tmp = array_unshift($amp_categories, "Select a category:"); 

   echo "<select name=\'amp_options[amp_cat]\'>";
   foreach ($amp_categories_obj as $amp_cat) {
    $selected = ($options[\'amp_cat\']==$amp_cat) ? \'selected="selected"\' : \'\';
    echo "<option value=\'$amp_cat\' $selected>$amp_cat</option>";
   }
   echo "</select>";

   ?>
            </p>