我在自定义woocommerce模板的单个产品页面中构建了一个循环，以根据我创建的自定义分类法输出特定的产品。然而，我一直不明白为什么，但我正试图将“else”推到ul循环之外，以便在没有产品可显示时显示自定义消息，但我不断收到意外的“else”语句错误消息：

<ul class="products columns-4">
  <?php
  $terms = get_the_terms($post->ID, \'product-lines\', \'string\');
  $term_ids = wp_list_pluck($terms, \'term_id\');

  foreach ($terms as $term) {
    $args = array(
    \'post_type\'           => \'product\',
    \'orderby\'             => \'date\',
    \'order\'               => \'DESC\',
    \'ignore_sticky_posts\' => 1,
    \'post_status\'         => \'publish\',
    \'posts_per_page\'      => -1,
    \'post__not_in\'        => array( $post->ID ),
    \'tax_query\'           => array(
      \'relation\'          => \'AND\',
      array(
        \'taxonomy\'    => \'product-lines\',
        \'field\'       => \'id\',
        \'terms\'       => $term_ids
      ),
      array(
        \'taxonomy\'    => \'product-types\',
        \'field\'       => \'slug\',
        \'terms\'       => \'moldings\'
      )
    )
  );

  $product_tiles_loop = new WP_Query($args);

  if ($product_tiles_loop->have_posts()) {
    while ($product_tiles_loop->have_posts()) : $product_tiles_loop->the_post(); ?>

    <li <?php post_class(); ?>>
      <div class="product-h">
        <a class="woocommerce-LoopProduct-link woocommerce-loop-product__link" href="<?php the_permalink(); ?>">
          <?php the_post_thumbnail(); ?>
          <div class="post-meta">
            <h2 class="woocommerce-loop-product__title"><?php the_title(); ?></h2>
          </div>
        </a>
        <a class="button product_type_simple" href="<?php the_permalink(); ?>" rel="nofollow">View Product</a>
      </div>
    </li>

    <?php endwhile; } // END if have_posts loop
      else {
        echo \'Sorry, there are no Moldings in this Product Line\';
      }
      wp_reset_postdata();
    }
  ?>
</ul>

我尝试将ul移动到if have\\u posts（）语句的内部，但在while语句的外部，我得到了错误，如下所示：

<div class="product-loop-wrapper">
  <?php
  $terms = get_the_terms($post->ID, \'product-lines\', \'string\');
  $term_ids = wp_list_pluck($terms, \'term_id\');

  foreach ($terms as $term) {
    $args = array(
    \'post_type\'           => \'product\',
    \'orderby\'             => \'date\',
    \'order\'               => \'DESC\',
    \'ignore_sticky_posts\' => 1,
    \'post_status\'         => \'publish\',
    \'posts_per_page\'      => -1,
    \'post__not_in\'        => array( $post->ID ),
    \'tax_query\'           => array(
      \'relation\'          => \'AND\',
      array(
        \'taxonomy\'    => \'product-lines\',
        \'field\'       => \'id\',
        \'terms\'       => $term_ids
      ),
      array(
        \'taxonomy\'    => \'product-types\',
        \'field\'       => \'slug\',
        \'terms\'       => \'moldings\'
      )
    )
  );

  $product_tiles_loop = new WP_Query($args);

  if ($product_tiles_loop->have_posts()) { ?>
    <ul class="products columns-4">

      <?php while ($product_tiles_loop->have_posts()) : $product_tiles_loop->the_post(); ?>

      <li <?php post_class(); ?>>
        <div class="product-h">
          <a class="woocommerce-LoopProduct-link woocommerce-loop-product__link" href="<?php the_permalink(); ?>">
            <?php the_post_thumbnail(); ?>
            <div class="post-meta">
              <h2 class="woocommerce-loop-product__title"><?php the_title(); ?></h2>
            </div>
          </a>
          <a class="button product_type_simple" href="<?php the_permalink(); ?>" rel="nofollow">View Product</a>
        </div>
      </li>

      <?php endwhile; } // END if have_posts loop ?>
    </ul>
    <?php 
      else {
        echo \'Sorry, there are no Moldings in this Product Line\';
      }
      wp_reset_postdata();
    }
  ?>
</div>

不知道我在这里错过了什么。

<div class="product-loop-wrapper">
  <?php
  $terms = get_the_terms($post->ID, \'product-lines\', \'string\');
  $term_ids = wp_list_pluck($terms, \'term_id\');

  foreach ($terms as $term) {
    $args = array(
    \'post_type\'           => \'product\',
    \'orderby\'             => \'date\',
    \'order\'               => \'DESC\',
    \'ignore_sticky_posts\' => 1,
    \'post_status\'         => \'publish\',
    \'posts_per_page\'      => -1,
    \'post__not_in\'        => array( $post->ID ),
    \'tax_query\'           => array(
      \'relation\'          => \'AND\',
      array(
        \'taxonomy\'    => \'product-lines\',
        \'field\'       => \'id\',
        \'terms\'       => $term_ids
      ),
      array(
        \'taxonomy\'    => \'product-types\',
        \'field\'       => \'slug\',
        \'terms\'       => \'moldings\'
      )
    )
  );

  $product_tiles_loop = new WP_Query($args);

  if ($product_tiles_loop->have_posts()) { ?>
    <ul class="products columns-4">

      <?php while ($product_tiles_loop->have_posts()) : $product_tiles_loop->the_post(); ?>

      <li <?php post_class(); ?>>
        <div class="product-h">
          <a class="woocommerce-LoopProduct-link woocommerce-loop-product__link" href="<?php the_permalink(); ?>">
            <?php the_post_thumbnail(); ?>
            <div class="post-meta">
              <h2 class="woocommerce-loop-product__title"><?php the_title(); ?></h2>
            </div>
          </a>
          <a class="button product_type_simple" href="<?php the_permalink(); ?>" rel="nofollow">View Product</a>
        </div>
      </li>

      <?php endwhile;  // END if have_posts loop ?>
    </ul>
    <?php
      } else {
        echo \'Sorry, there are no Moldings in this Product Line\';
      }
      wp_reset_postdata();
    }
  ?>
</div>