正在尝试使用以下方式限制WooCommerce特色产品滑块文本的摘录长度：

function custom_excerpt_length( $length ) {
    return 15;
}
add_filter( \'excerpt_length\', __NAMESPACE__ . \'\\\\custom_excerpt_length\');

我可以使用此功能将博客页面文章摘录为一定长度。它工作得很好。但是，对于WooCommerce特色产品滑块功能，我使用$productIntro = get_the_excerpt( $post ); 这不起作用。它仍然显示了整个产品的简短描述。

以下是完整功能：

function featured_products_slider()
{

    $args = array(
        \'post_type\' => \'product\',
        \'meta_key\'   => \'_featured\',
        \'meta_value\'    =>  \'yes\',
        \'post_status\' => \'publish\'
    );

    $featured   = get_posts($args);

    foreach ($featured as $post) {
        $thumb_id = get_post_thumbnail_id($post, \'featured\');
        $imageUrl = wp_get_attachment_url($thumb_id);
        $permaLink=     get_permalink($post);
        $authorID   =   $post->post_author;
        $productIntro     =   get_the_excerpt( $post );
        $title  =   $post->post_title;
        $date = get_the_date(\'M j, Y\', $post->ID);
        ?>
            <li>
                <div class="featured-post-slide">
                    <div class="post-background" style="background-image:url(\'<?=$imageUrl;?>\');"></div>
                    <div class="shadow"></div>
                    <div class="post-content">
                        <h1 class="slide-title">
                            <a href="<?=$permaLink?>"><?=$title?></a></h1>
                        <p>
                            <?= $productIntro ?>
                        </p>
                        <a href="<?=$permaLink?>" title="<?=$title?>" class="button stroke more-link">Shop now</a>
                    </div>
                </div>
            </li>
            <?php
    }
}

你知道为什么这个过滤器用于博客页面显示而不是我的特色产品滑块吗？

function featured_products_slider()
{

    $args = array(
        \'post_type\' => \'product\',
        \'meta_key\'   => \'_featured\',
        \'meta_value\'    =>  \'yes\',
        \'post_status\' => \'publish\'
    );

    $featured   = get_posts($args);

    foreach ($featured as $post) {
        $thumb_id = get_post_thumbnail_id($post, \'featured\');
        $imageUrl = wp_get_attachment_url($thumb_id);
        $permaLink=     get_permalink($post);
        $authorID   =   $post->post_author;
        $post_excerpt     =   get_the_excerpt( $post );
        $productIntro = substr($post_excerpt, 1, 140);
        $title  =   $post->post_title;
        $date = get_the_date(\'M j, Y\', $post->ID);
        ?>
            <li>
                <div class="featured-post-slide">
                    <div class="post-background" style="background-image:url(\'<?=$imageUrl;?>\');"></div>
                    <div class="shadow"></div>
                    <div class="post-content">
                        <h1 class="slide-title">
                            <a href="<?=$permaLink?>"><?=$title?></a></h1>
                        <p>
                            <?= $productIntro ?>
                        </p>
                        <a href="<?=$permaLink?>" title="<?=$title?>" class="button stroke more-link">Shop now</a>
                    </div>
                </div>
            </li>
            <?php
    }
}