WordPress循环中动态生成JSON并避免末尾逗号的技巧

"review": [{
    // ... review 1 content ...
  },
  {
    // ... review 2 content ...
  }, <-- 这个逗号是多余的
],
"aggregateRating": {
  // ...
}

"review": [
    <?php
    $args = array(
        'post_type' => 'my_reviews',
        'category_name' => 'my-product', 
        'paged' => $paged
    );

    $loop = new WP_Query($args);
    if ($loop->have_posts()) :
        while ($loop->have_posts()) : $loop->the_post(); ?>
            {
                "@type": "Review",
                "reviewRating": {
                    "@type": "Rating",
                    "ratingValue": "5"
                },
                "author": {
                    "@type": "Person",
                    "name": "<?php the_title(); ?>"
                },
                "reviewBody": "<?php echo esc_attr(get_the_content()); ?>"
            }<?php
            // 判断是否是最后一个元素，如果不是则输出逗号
            if ($loop->current_post + 1 != $loop->post_count) {
                echo ',';
            }
        endwhile;
    endif;
    wp_reset_postdata();
    ?>
],

<?php
// 1. 定义一个主数组来存储所有JSON数据
$schemaData = [
    'review' => [],
    'aggregateRating' => []
];

// 2. 获取并循环处理文章，构建评论数组
$args = array(
    'post_type' => 'my_reviews',
    'category_name' => 'my-product', 
    'paged' => $paged
);

$loop = new WP_Query($args);
if ($loop->have_posts()) :
    while ($loop->have_posts()) : $loop->the_post();
        // 为当前文章创建一个评论对象数组
        $post_review = [
            "@type" => "Review",
            "reviewRating" => [
                "@type" => "Rating",
                "ratingValue" => "5" // 假设所有评论都是5星，实际应动态获取
            ],
            "author" => [
                "@type" => "Person",
                "name" => get_the_title() // 获取文章标题作为作者名
            ],
            "reviewBody" => get_the_content() // 获取文章内容作为评论体
        ];

        // 将当前评论对象添加到主数组的 'review' 键下
        $schemaData['review'][] = $post_review;

    endwhile;
endif;
wp_reset_postdata();

// 3. 构建聚合评分数据
$aggRating = [
    "@type" => "AggregateRating",
    "ratingValue" => "5", // 假设聚合评分为5，实际应动态计算
    "bestRating" => "5",
    "ratingCount" => count_cat_post('My Product') // 假设有一个函数获取分类文章数
];

// 将聚合评分添加到主数组
$schemaData['aggregateRating'] = $aggRating;

// 4. 使用 json_encode 将整个PHP数组转换为JSON字符串
$jsonOutput = json_encode($schemaData, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);

// 输出JSON字符串
echo $jsonOutput;
?>