php - 使用 php 对 foreach 循环内的日期进行排序

Question

我正在尝试构建一个函数，用 php 循环显示来自外部 json feed 的评论。除了排序之外，一切正常。

我想根据日期对项目进行排序。

<?php
$json_url = get_field('review_json_url', 'option'); // path to your JSON file
$data = file_get_contents($json_url); // put the contents of the file into a variable
$reviews = json_decode($data); // decode the JSON feed  
?>

<?php 
$count=0;               
foreach ($reviews->beoordelingen as $review) if ($count < 10) {
// vars
$publish_date = $review->date_created;
$name = $review->klant_naam;
$title = $review->title;
$content = $review->tekst;
$date = new DateTime($publish_date);
?>
<div class="review">
    <h3 class="name"><?php echo $name; ?></h3>
    <h5 class="location"><?php echo $date->format('d-m-Y'); ?></h5>
    <h4 class="subtitle">"<?php echo $title; ?>"</h4>
    <div class="content">
        <p><?php echo $content; ?></p>
    </div>
</div>
<?php $count++; } ?>

Answer 1

通常在这些情况下，我发现最好在显示之前组织数据。下面我通过设置 1 个 foreach 来处理“逻辑”和 1 个 foreach 来处理实际显示数据来完成此操作。

从这里开始，就像添加自定义排序算法一样简单。 (有关更深入的示例，请参阅 PHP Sort Array By SubArray Value)

<?php 

$sorted_reviews = array();
foreach ($reviews->beoordelingen as $review) {
    $date             = new DateTime($publish_date);
    $sorted_reviews[] = array(
        'publish_date' => $review->date_created,
        'name'         => $review->klant_naam,
        'title'        => $review->title,
        'content'      => $review->tekst,
        'date'         => $date,
        'sortable'     => $date->getTimestamp(),
    );
}

usort($sorted_reviews, 'sortByOption');
function sortByOption($a, $b) {
    return strcmp($a['sortable'], $b['sortable']);
}

$count=0;
foreach ($sorted_reviews as $review) if ($count < 10) {
?>
<div class="review">
    <h3 class="name"><?php echo $review['name']; ?></h3>
    <h5 class="location"><?php echo $review['date']->format('d-m-Y'); ?></h5>
    <h4 class="subtitle">"<?php echo $review['title']; ?>"</h4>
    <div class="content">
        <p><?php echo $review['content']; ?></p>
    </div>
</div>
<?php $count++; } ?>