我正在开发一个插件。该插件可定制帖子类型“product”。首先我使用template_redirect 重定向到单个页面和类别页面的操作。

以下是我的template\\u重定向代码：

add_action("template_redirect", \'my_theme_redirect\');
function my_theme_redirect() {

    global $wp;
    $plugindir = dirname(__FILE__);
    //A Specific Custom Post Type
    if ($wp->query_vars["post_type"] == \'product\') {
        $templatefilename = \'single-product.php\';
        if (file_exists(TEMPLATEPATH . \'/\' . $templatefilename)) {
            $return_template = TEMPLATEPATH . \'/\' . $templatefilename;
        } else {
            $return_template = $plugindir . \'/themefiles/\' . $templatefilename;
        }
        do_theme_redirect($return_template);
    }
    if (is_tax(\'prodcategories\')) {
        $templatefilename = \'taxonomy-prodcategories.php\';
        if (file_exists(TEMPLATEPATH . \'/\' . $templatefilename)) {
            $return_template = TEMPLATEPATH . \'/\' . $templatefilename;
        } else {
            $return_template = $plugindir . \'/themefiles/\' . $templatefilename;
        }
        do_theme_redirect($return_template);
    }
}

function do_theme_redirect($url) {
    global $post, $wp_query;
    if (have_posts()) {
        include($url);
        die();
    } else {
        $wp_query->is_404 = true;
    }
}

它工作得很好。但现在我想用template_include 过滤器，但它不工作，我的网站变成空白。

以下是template\\u include代码：

add_filter("template_include", \'my_theme_redirect\');
function my_theme_redirect($templatefilename) {

    global $wp;
    $plugindir = dirname(__FILE__);
    //A Specific Custom Post Type
    if ($wp->query_vars["post_type"] == \'product\') {
        $templatefilename = \'single-product.php\';
        if (file_exists(TEMPLATEPATH . \'/\' . $templatefilename)) {
            $return_template = TEMPLATEPATH . \'/\' . $templatefilename;
        } else {
            $return_template = $plugindir . \'/themefiles/\' . $templatefilename;
        }
        return $return_template;
    }
    if (is_tax(\'prodcategories\')) {
        $templatefilename = \'taxonomy-prodcategories.php\';
        if (file_exists(TEMPLATEPATH . \'/\' . $templatefilename)) {
            $return_template = TEMPLATEPATH . \'/\' . $templatefilename;
        } else {
            $return_template = $plugindir . \'/themefiles/\' . $templatefilename;
        }
        return $return_template;
    }
}

function do_theme_redirect($url) {
    global $post, $wp_query;
    if (have_posts()) {
        include($url);
        die();
    } else {
        $wp_query->is_404 = true;
    }
}

我哪里出了问题，有什么建议吗

function template_chooser($template){
    global $wp_query;
    $plugindir = dirname(__FILE__);

    $post_type = get_query_var(\'post_type\');

    if( $post_type == \'product\' ){
        return $plugindir . \'/themefiles/single-product.php\';
    }

    if (is_tax(\'prodcategories\')) {
        return $plugindir . \'/themefiles/taxonomy-prodcategories.php\';
    }

    return $template;   
}
add_filter(\'template_include\', \'template_chooser\');

add_filter( \'template_include\', \'wpse138858_woocommerce_category_archive_template\');


function wpse138858_woocommerce_category_archive_template( $original_template ) {
    // we\'re loading the template conditionally, 


  global $post;
   if (is_archive() && get_post_type($post)==\'ym_package\') {
        // you\'ve to create the template you want to use here first
        return get_template_directory().\'/archive-ym_package.php\';
    } 
    else if(is_archive() && get_post_type($post)==\'ym_place\') {
        // you\'ve to create the template you want to use here first
        return get_template_directory().\'/archive-ym_place.php\';
    } 


    else {
        return $original_template;
    }
}

add_filter( \'template_include\', \'load_my_custom_template\', 99, 1 );
 function load_custom_templates($template) {
   $post_type = \'article\';
   if( is_post_type_archive( $post_type ) && file_exists( plugin_dir_path(__FILE__) . 
      \'templates/archive_help_lessions.php\' ) ){
      $template = trailingslashit( plugin_dir_path( __FILE__ ) .\'app/templates\' ).\'archive_articles.php\';
   }
   if ( is_singular( $post_type ) ) {
      $template = trailingslashit( plugin_dir_path( __FILE__ ) .\'app/templates\' ).\'single_article.php\';
  }
   return $template;
}