我想要的是显示名为“page\\u template”的自定义字段的值。我使用下面的代码，但它在Page Template列下不显示任何内容，尽管我已经为页面的Page\\u Template自定义字段定义了一个值

add_filter(\'manage_pages_columns\', \'column_page\');
function column_page($defaults) {
    $defaults[\'column_template\'] = \'Page Template\';
    return $defaults;
}


function page_template_field() {
    $custom_field_id = get_post_meta($post_ID);
    if ($custom_field_id) {
        $custom_field_value = get_post_meta($custom_field_id,\'page_template\');
        return $custom_field_value;
    }
}  

add_action(\'manage_pages_custom_column\',\'column_page_content\',10,2);
function column_page_content($column_name, $post_ID) {
    if ($column_name == \'column_template\') {
        $column_template_list = page_template_field($post_ID);    
        if ($column_template_list) {
            echo \'<p> \'. $column_template_list .\' </p>\';
        }
    }
}