使用 PHP WordPress 循环删除 Schema 数组中最后一个对象后的逗号 [重复]

Question

我有一个“产品”谷歌架构标记，其中包含“评论”的粘贴循环。 这是标记代码的一部分：

     "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 get_the_content(); ?>"},
    <?php
    endwhile;
    endif;
    wp_reset_postdata();
    ?>],
    
          "aggregateRating": {
            "@type": "AggregateRating",
            "ratingValue": "5",
            "bestRating": "5",
            "ratingCount": "<?php echo count_cat_post('My Product'); ?>"
},

一切正常，除了在最后一个对象的} 之后，逗号仍然被困住。 结果是这样的：

   "review": [{
        "@type": "Review",
        "reviewRating": {
          "@type": "Rating",
          "ratingValue": "5"
        },
        "author": {
          "@type": "Person",
          "name": "John Doe"
        },
        "reviewBody": "Review 1 Content"
      },
      {
        "@type": "Review",
        "reviewRating": {
          "@type": "Rating",
          "ratingValue": "1"
        },
        "author": {
          "@type": "Person",
          "name": "Jane Doe"
        },
        "reviewBody": "Review 2 Content."
      }, <-- this is the comma I need to remove
],
      "aggregateRating": {
        "@type": "AggregateRating",
        "ratingValue": "88",
        "bestRating": "100",
        "ratingCount": "2"
      },

我怎样才能删除它？

Answer 1

您不应该通过连接循环来创建 JSON，而是在循环中将文本添加到数组中，然后使用 implode(',',$yourArray) 将数组转换为 JSON，其中最后一个逗号将不存在.

或者更好的方法是创建嵌套数组，并使用json_encode() 函数从嵌套数组中创建有效的 JSON。

Answer 2

在 wordpress 循环中，index 的属性为 current_post，total number of posts 的属性为 post_count。您可以使用条件($loop->current_post + 1 != $loop->post_count)来比较它不是最后一个帖子，然后您可以打印逗号。

所以get_the_content 的代码应该是这样的：

"reviewBody": "<?php echo get_the_content(); ?>"} <?php if ($loop->current_post + 1 != $loop->post_count) { echo ','; } ?>

所有其他人的更新：我知道json_encode 是正确的方式，但他在评论中说他想要这样。但对于未来的观众来说，正确的做法应该是这样的：

// define reviews array
   $reviewArr = [
       'review' => [],
       'aggregateRating' => []
   ];

   // get and loop through posts
    $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();

        // new post review
        $post_review = [
            
            "@type" => "Review",
            "reviewRating" => [
              "@type" => "Rating",
              "ratingValue" => "5"
            ],
            "author" => [
              "@type" => "Person",
              "name" => "<?php the_title(); ?>"
            ],
            "reviewBody" => get_the_content()
        ];

        // insert the post review in reviews array
        $reviewArr['review'][] = $post_review;

    endwhile;
    endif;
    wp_reset_postdata();

    // aggregate rating
    $aggRating =  [
        "@type" => "AggregateRating",
        "ratingValue" => "5",
        "bestRating" => "5",
        "ratingCount" => count_cat_post('My Product')
    ];

    // insert in reviews array
    $reviewArr['aggregateRating'] = $aggRating;


    //  here you get your json
    $json = json_encode($reviewArr);