是的，这是可能的。您需要使用template_include 滤器

要为自定义帖子类型“my\\u custom\\u post\\u type”返回不同的模板，可以执行以下操作：

add_filter( \'template_include\', \'wpse_272261_template_include\', 100 );
function wpse_272261_template_include( $template ) {
  if ( is_singular( [ \'my_custom_post_type\' ] ) ) return PATH_TO . \'template.php\';
  return $template;
}

您可以使用the_content 筛选器将您自己的代码添加到the_content() 作用

其工作原理如下：

function my_add_to_content( $current_content ) {
    ob_start();

    /*
    Add code here to output what you need to append to the content.
    Since this is between ob_start() and ob_get_clean() you can treat it like a
    template and echo the content/markup you need.
    */

    $additional_content = ob_get_clean();

    $new_content = $current_content . $additional_content;

    return $new_content;
}
add_filter( \'the_content\', \'my_add_to_content\', 99 );