调试为什么精选图片在WooCommerce主页上停止显示

有时，通常出现在我们主页上的“特色”图片已经停止显示。

我做了一些挖掘，在索引中找到了这个模板代码。php（这是Artificer WooThemes主题）

这似乎是处理特色图像的代码：

<ul class="featured-products">

<!-- The first 3 -->
<?php
$args = array( \'post_type\' => \'product\', \'posts_per_page\' => 3, \'meta_query\' => array( array(\'key\' => \'_visibility\',\'value\' => array(\'catalog\', \'visible\'),\'compare\' => \'IN\'),array(\'key\' => \'_featured\',\'value\' => \'yes\')) );
$loop = new WP_Query( $args );

while ( $loop->have_posts() ) : $loop->the_post(); $_product;

if ( function_exists( \'get_product\' ) ) {
    $_product = get_product( $loop->post->ID );
} else {
    $_product = new WC_Product( $loop->post->ID );
}

?><li class="featured">

            <?php //woocommerce_show_product_sale_flash( $post, $_product ); ?>
            <a href="<?php echo get_permalink( $loop->post->ID ) ?>" title="<?php echo esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID); ?>">
                <?php if (has_post_thumbnail( $loop->post->ID )) echo get_the_post_thumbnail($loop->post->ID, \'shop_catalog\'); else echo \'<img src="\'.woocommerce_placeholder_img_src().\'" alt="Placeholder" />\'; ?>


            <h3><?php the_title(); ?> <span class="price"><?php echo $_product->get_price_html(); ?></span></h3>

            </a>

    </li><?php endwhile; ?><!-- the large 1 --><?php
$args = array( \'post_type\' => \'product\', \'posts_per_page\' => 1, \'offset\' => 3, \'meta_query\' => array( array(\'key\' => \'_visibility\',\'value\' => array(\'catalog\', \'visible\'),\'compare\' => \'IN\'),array(\'key\' => \'_featured\',\'value\' => \'yes\')) );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
if ( function_exists( \'get_product\' ) ) {
    $_product = get_product( $loop->post->ID );
} else {
    $_product = new WC_Product( $loop->post->ID );
}
?><li class="featured">

            <?php //woocommerce_show_product_sale_flash( $post, $_product ); ?>
            <a href="<?php echo get_permalink( $loop->post->ID ) ?>" title="<?php echo esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID); ?>">
                <?php if (has_post_thumbnail( $loop->post->ID )) echo get_the_post_thumbnail($loop->post->ID, \'shop_single\'); else echo \'<img src="\'.woocommerce_placeholder_img_src().\'" alt="Placeholder" />\'; ?>


            <h3><?php the_title(); ?> <span class="price"><?php echo $_product->get_price_html(); ?></span></h3>

            </a>

        </li><?php endwhile; ?><!-- the last 3 --><?php
$args = array( \'post_type\' => \'product\', \'posts_per_page\' => 3, \'offset\' => 4, \'meta_query\' => array( array(\'key\' => \'_visibility\',\'value\' => array(\'catalog\', \'visible\'),\'compare\' => \'IN\'),array(\'key\' => \'_featured\',\'value\' => \'yes\')) );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post(); $_product;
if ( function_exists( \'get_product\' ) ) {
    $_product = get_product( $loop->post->ID );
} else {
    $_product = new WC_Product( $loop->post->ID );
}
?><li class="featured">

            <?php //woocommerce_show_product_sale_flash( $post, $_product ); ?>
            <a href="<?php echo get_permalink( $loop->post->ID ) ?>" title="<?php echo esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID); ?>">
                <?php if (has_post_thumbnail( $loop->post->ID )) echo get_the_post_thumbnail($loop->post->ID, \'shop_catalog\'); else echo \'<img src="\'.woocommerce_placeholder_img_src().\'" alt="Placeholder" />\'; ?>


            <h3><?php the_title(); ?> <span class="price"><?php echo $_product->get_price_html(); ?></span></h3>

            </a>

        </li><?php endwhile; ?>
</ul>

<?php } ?>

我了解了如何获取上次运行的SQL查询，它返回为：

SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts 
    INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) 
    INNER JOIN wp_postmeta AS mt1 ON ( wp_posts.ID = mt1.post_id ) 
    WHERE 1=1 
    AND ( 
        ( wp_postmeta.meta_key = \'_visibility\' AND wp_postmeta.meta_value IN (\'catalog\',\'visible\') ) 
        AND ( mt1.meta_key = \'_featured\' AND mt1.meta_value = \'yes\' ) ) 
        AND wp_posts.post_type = \'product\' AND (wp_posts.post_status = \'publish\' OR wp_posts.post_status = \'private\') 
        GROUP BY wp_posts.ID 
        ORDER BY wp_posts.post_date DESC 
        LIMIT 0, 3

果不其然，如果我在phpMyAdmin中运行它，我会得到一个ermpty结果集。为什么会突然发生这种情况？几周前，我们确实升级到了WooCommerce 3.0.5，所以我想知道是否内部有什么变化需要更新？

Update: 再深入一点，我发现这似乎并没有设定好：

( mt1.meta_key = \'_featured\' AND mt1.meta_value = \'yes\' ) )

他们在WooCommerce管理区显示为“特色”：

WooCommerce如何决定一篇文章是否具有特色？我对上述代码的理解是，它正在做：

wp_postmeta.meta_key = "_featured"
AND 
wp_postmeta.meta_value = "yes"

。。。但这不可能是正确的，因为wp_postmeta 表偶数匹配%featured% !

UPDATE 3: 按照建议，我在WP中打开了调试，现在我在主页上看到了这一点：

Notice: Undefined index: woo_enable_lightbox in /home/costumes/web/thecostumerooms.co.uk/public_html/test/wp-content/themes/artificer/includes/theme-woocommerce.php on line 274
Notice: Undefined index: woo_shop_archives_fullwidth in /home/costumes/web/thecostumerooms.co.uk/public_html/test/wp-content/themes/artificer/includes/theme-woocommerce.php on line 91
class="home blog logged-in admin-bar no-customize-support gecko alt-style-default two-col-left "> 

Notice: Undefined index: woo_display_store_info in /home/costumes/web/thecostumerooms.co.uk/public_html/test/wp-content/themes/artificer/index.php on line 141

Notice: Undefined index: woo_display_store_info in /home/costumes/web/thecostumerooms.co.uk/public_html/test/wp-content/themes/artificer/index.php on line 144

Notice: Undefined index: woo_display_store_info in /home/costumes/web/thecostumerooms.co.uk/public_html/test/wp-content/themes/artificer/index.php on line 167

这是最新WP的普通安装，以及Artificer和WooCommerce（3.0.5）

小码农CODE

这些是WooCommerce 3。仅x说明

对于非开发人员：

对于开发人员：

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