自定义帖子类型页面模板未显示

我创建了一个名为portfolio的自定义帖子类型。我还创建了一个名为single portfolio的文件。php显示公文包内容。

创建公文包帖子时，我要使用的模板不会显示在属性部分下的下拉列表中。事实上，在我创建第一个公文包帖子之前，下拉列表根本不会显示，此时，下拉列表中填充了两个项目：

-（无父级）

-[第一个投资组合帖子的标题]

下面是函数中的内容。php

add_action(\'init\', \'create_portfolio\');
function create_portfolio() {
$labels = array(
    \'name\' => _x(\'My Portfolio\', \'post type general name\'),
    \'singular_name\' => _x(\'Portfolio Item\', \'post type singular name\'),
    \'add_new\' => _x(\'Add New\', \'portfolio item\'),
    \'add_new_item\' => __(\'Add New Portfolio Item\'),
    \'edit_item\' => __(\'Edit Portfolio Item\'),
    \'new_item\' => __(\'New Portfolio Item\'),
    \'view_item\' => __(\'View Portfolio Item\'),
    \'search_items\' => __(\'Search Portfolio\'),
    \'not_found\' =>  __(\'Nothing found\'),
    \'not_found_in_trash\' => __(\'Nothing found in Trash\'),
    \'parent_item_colon\' => \'\'
);
$portfolio_args = array(
    \'labels\' => $labels,
    \'label\' => __(\'Portfolio\'),
    \'singular_label\' => __(\'Portfolio\'),
    \'public\' => true,
    \'show_ui\' => true,
    \'capability_type\' => \'post\',
    \'hierarchical\' => true,
    \'has_archive\' => true,
    \'rewrite\' => array("slug" => "portfolio"),
    \'can_export\' => true,
    \'supports\' => array(\'title\', \'editor\', \'thumbnail\', \'excerpt\', \'page-attributes\')
   );
register_post_type(\'portfolio\',$portfolio_args);
}

和单一投资组合。php

<?php
/*
Template Name: Single Portfolio
*/
?>
<?php get_header(); ?>
<div id="main">
<?php $loop = new WP_Query(array(\'post_type\' => \'portfolio\', \'posts_per_page\' => 10)); 
?>
<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
<?php   
    $custom = get_post_custom($post->ID);
    $screenshot_url = $custom["screenshot_url"][0];
    $website_url = $custom["website_url"][0];
    $date_completed = $custom["date_completed"][0];
?>
    <div id="portfolio-item">
<h1><?php the_title(); ?></h1>
<?php echo \'Completed:\'; $custom["year_completed"][0]; ?>
<a href="<?=$website_url?>"><?php the_post_thumbnail(); ?> </a>
<?php the_content(); ?>
</div>
    <?php endwhile; ?>

</div><!--MAIN-->
<?php get_sidebar(); ?>
<?php get_footer(); ?>

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