我正在wordpress管理帖子页面上使用自定义字段，添加以下代码，然后尝试根据帖子视图对帖子进行排序，但排序不起作用。下面是我在函数中添加的代码。php：

add_filter(\'manage_posts_columns\', \'posts_column_views\');
add_action(\'manage_posts_custom_column\', \'posts_custom_column_views\',5,2);
function posts_column_views($defaults){
    $defaults[\'post_views\'] = __(\'Views\');
    return $defaults;
}
function posts_custom_column_views($column_name, $id){
    if($column_name === \'post_views\'){
        echo getPostViews(get_the_ID());
    }
}

// Register the column as sortable
function posts_column_register_sortable( $columns ) {
$columns[\'post_views\'] = \'post_views\';

return $columns;
}
add_filter( \'manage_edit-post_sortable_columns\', \'posts_column_register_sortable\' );


function posts_column_orderby( $vars ) {
if ( isset( $vars[\'orderby\'] ) && \'post_views_count\' == $vars[\'orderby\'] ) {
    $vars = array_merge( $vars, array(
        \'meta_key\' => \'post_views\',
        \'orderby\' => \'meta_value_num\'
    ) );
}

return $vars;
}
add_filter( \'request\', \'posts_column_orderby\' );


function getPostViews($postID){
    $count_key = \'post_views_count\';
    $count = get_post_meta($postID, $count_key, true);
    if($count==\'\'){
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, \'0\');
        return "0";
    }
    return $count;
}
function setPostViews($postID) {
if (!current_user_can(\'level_7\') ) :
    $count_key = \'post_views_count\';
    $count = get_post_meta($postID, $count_key, true);
    if($count==\'\'){
        $count = 0;
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, \'0\');
    }else{
        $count++;
        update_post_meta($postID, $count_key, $count);
    }
endif;
}

现在的问题是，我可以在wordpress管理编辑中看到帖子视图。php页面和volumn视图也可以排序，但单击视图列不会根据视图对帖子进行排序。

请帮我解决这个问题。