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

Question

我有一个"产品"；谷歌模式标记(Google Schema Markup(；评论"；。这是Markup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，只是在最后一个对象的}之后，逗号仍然被捕获。结果如下：

"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"
},

如何移除它？

Answer 1

在wordpress循环中，index具有属性current_post，total number of posts具有属性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篇文章，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 ','; } ?>

为所有其他人更新：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，正确的方法应该是这样的：

// 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);

Answer 2

您不应该通过与循环串联来创建JSON，而是应该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，因为最后一个逗号不存在。

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一个有效的JSON。