提供可由主题挂钩覆盖的默认模板template_include 就像链接的问题所暗示的那样。你得到了WordPress想要用作参数的模板。如果这不是您想要的文件，请将其替换为您插件的文件：

add_filter( \'template_include\', \'wpse_57232_render_cpt\', 100 );

/**
 * Provide fall back template file for a custom post type single view.
 *
 * @return void
 */
function wpse_57232_render_cpt( $template )
{
    // Our custom post type.
    $post_type = \'my_custom_cpt\';

    // WordPress has already found the correct template in the theme.
    if ( FALSE !== strpos( $template, "/single-$post_type.php" ) )
    {
        // return the template in theme  
        return $template;
    }

    // Send our plugin file.
    if ( is_singular() && $post_type === get_post_type( $GLOBALS[\'post\'] ) )
    {
        // return plugin file
        return dirname( __FILE__ ) . "/single-$post_type.php";
    }

    // Not our post type single view.
    return $template;
}