正在使用输出的字符串print_r() 是称为序列化字符串的内容。当WordPress在1个自定义字段中存储一个值数组时，它会使用一个名为serialize()

你想做的是unserialize 字符串，然后可以访问数组中的每个“关联索引”。

通常get_post_meta() 为您取消序列化字符串，但它看起来像自定义函数GetSettings::getPostMeta() 没有。在这种情况下，我们可以运行maybe_unserialize() 如果能够，它将转换为可用的数组。

然后我们可以简单地在数组中循环，输出所需的内容。

$aCoupon = GetSettings::getPostMeta($post->ID, \'coupon\');
$aCoupon = maybe_unserialze( $aCoupon );
if ( empty( $aCoupon ) ){
    foreach ( $aCoupon as $key => $value ) {
        echo \'<div><span class="label">\' . $key . \'</span> \' . $value . \'</div>\';
    }
}

根据您的示例，它将输出如下内容。

<div><span class="label">highlight</span> Test Highlight</div>
<div><span class="label">title</span> 50% off food</div>
<div><span class="label">description</span> Test description</div>
<div><span class="label">code</span> 1524521</div>
<div><span class="label">popup_image</span> 4548</div>
<div><span class="label">popup_description</span> Popup description</div>
<div><span class="label">redirect_to</span> </div>

或者，如果要直接访问1个值。

$aCoupon = GetSettings::getPostMeta($post->ID, \'coupon\');
$aCoupon = maybe_unserialze( $aCoupon );
if ( empty( $aCoupon ) ){
    //If the title is set, and is not empty, output it.
    if ( isset( $aCoupon[\'title\'] ) && \'\' !== $aCoupon[\'title\'] ) {
        echo \'<div><span class="label">Title</span> \' . $aCoupon[\'title\'] . \'</div>\';
    }
}

@Shaun21uk编辑-我做了一些小改动（下面是完整代码）。不管什么原因$aCoupon = GetSettings::getPostMeta($coupon_id, \'coupon\'); 我仍然想知道如何利用主题处理数据的方式。

您的短代码函数应该如下所示：

add_shortcode( \'qg_shortcode\', \'qg_shortcode\' );
function qg_shortcode() {

    $q = new WP_Query(array(
        \'post_type\' => \'listing\',
        \'posts_per_page\' => 5,
        \'meta_key\' => \'wc_coupon\',
        \'meta_value\' => \' \',
        \'meta_compare\' => \'!=\'
    ));

    if ( $q->have_posts() ) :
        while ( $q->have_posts() ) : $q->the_post();

            echo \'<h2 class="text-center"><a href="\' . get_permalink() . \'">\';
                the_title();
            echo \'</a></h2>\';

            the_content();

            // Get the ID of the attached coupon.
            $coupon_id = get_post_meta( get_the_ID(), \'wc_coupon\', true );

            // Get the coupon details from the coupon using the coupons ID.
        $aCoupon = maybe_unserialize( $coupon_id );

            // This checks if the coupon details are NOT empty, if that is true, then output the info.
            if ( ! empty( $aCoupon ) ) {

                // If the title is set, and is not empty, output it.
                if ( isset( $aCoupon[\'title\'] ) && \'\' !== $aCoupon[\'title\'] ) {
                    echo \'<div><span class="label">Title</span> \' . $aCoupon[\'title\'] . \'</div>\';
                }
            }

            echo\'<div class="offer-button">\';
            echo\'<a href="\' . get_permalink() . \'" class="offer-button-text">Claim this offer!</a>\';
            echo\'</div>\';
        endwhile;
        wp_reset_postdata();
    endif;
}