我正在尝试使用Flexslider制作多个图库帖子。问题是，它只在第一次渲染滑块，而在第二次发布时没有滑块。以下是我目前掌握的代码：

Main function to retrieve attachment images from post

<?php
    function deo_get_attachment( $num = 1 ){

      $output = \'\';
      if( has_post_thumbnail() && $num == 1 ): 
        $output = wp_get_attachment_url( get_post_thumbnail_id( get_the_ID() ) );
      else:
        $attachments = get_posts( array( 
          \'post_type\'       => \'attachment\',
          \'posts_per_page\'  => $num,
          \'orderby\'         => \'none\',
          \'post_parent\'     => get_the_ID()
        ) );
        if( $attachments && $num == 1 ):
          foreach ( $attachments as $attachment ):
            $output = wp_get_attachment_url( $attachment->ID );
          endforeach;
        elseif( $attachments && $num > 1 ):
          $output = $attachments;
        endif;

        wp_reset_postdata();

      endif;

      return $output;
    }
?>

Code to display slider:

  <?php if ( deo_get_attachment() ) : 
    $attachments = deo_get_attachment(10);
  ?>
    <div class="entry-slider">
      <div class="flexslider dots-inside">
        <ul class="slides clearfix">

          <?php foreach( $attachments as $attachment ) : ?>
            <li>
              <a href="<?php echo esc_url( get_permalink() ); ?>">
                <img src="<?php echo wp_get_attachment_url( $attachment->ID ); ?>" alt="">
              </a>
            </li>
          <?php endforeach; ?>

        </ul>
      </div>
    </div>

  <?php endif; ?>