我试图从下拉列表中只显示选定的类别（或taxomony），现在我的代码跳转到选定类别的另一页。我该怎么做？

$option ;
$categories = get_categories(); 
foreach ($categories as $category) {
    $option .= \'<option value="\'.get_option(\'home\').\'/category/\'.$category->slug.\'">\';
    $option .= $category->cat_name;
    //$option .= \' (\'.$category->category_count.\')\';
    $option .= \'</option>\';
}
echo $option;