在$query循环遍历自定义分类法时，Funders分类出现数据累加问题

问题 #

在WordPress页面的「Current Research Focus」区块中，每个区块需要展示关联的Researchers、Partners和Funders（三者均为自定义分类法）。其中Researchers和Partners显示正常，但Funders会累加所有区块的结果——到最后一个区块时，会包含前面所有区块的资助者名称。三者循环逻辑看似一致，求问题原因。

页面相关代码 #

while ($query->have_posts())
{
        $query->the_post();

        global $post;
        $topic = wp_get_object_terms( $post->ID, 'topic', array('taxonomy' => 'topic') );
        ?>

        <div class="current-research-container">
            <div class="current-research-body">
                <div class="current-research-header">
                    <h5 class="current-research-focus">current research focus</h5>
                    <div class="current-research-topics-container">
                        <?php
                        foreach($topic as $topics) {
                            $color = get_field('topic-color', 'topic' . '_' . $topics->term_id);
                            echo '<a class="current-research-button" style="border-color:' . $color . ';"href="' . get_category_link($topics->term_id) . '">' . $topics->name . '</a>';
                        }  ?>
                    </div>

                </div>
                    <h4><?php the_title(); ?></h4>
                    <p class="current-research-bio"><?php echo get_field('research_text'); ?></p>

                    <?php
                    $terms_author = get_the_terms( $post->ID, 'authors' );

                    if ($terms_author) {
                        $terms_author_str = array();
                        echo '<p class="taxonomy-data"><strong>Researchers </strong>';
                            foreach($terms_author as $term_author) {
                                $terms_author_str[] = $term_author->name;
                            }
                        echo implode(", ",$terms_author_str);
                    }

                    $terms_partner = get_the_terms( $post->ID, 'partners' );

                    if ($terms_partner) {
                        $terms_partner_str = array();
                        echo '<p class="taxonomy-data"><strong>Partners </strong>';
                            foreach($terms_partner as $term_partner) {
                                $terms_partner_str[] = $term_partner->name;
                            }
                            echo implode(", ",$terms_partner_str);
                    }

                    $terms_funder = get_the_terms( $post->ID, 'funders' );

                    if ($terms_funder) {
                        echo '<p class="taxonomy-data"><strong>Funders </strong>';
                            foreach($terms_funder as $term_funder) {
                                $terms_funder_str[] = $term_funder->name;
                            }
                            echo implode(", ",$terms_funder_str);
                    } ?>

                </div>
            <?php $image = get_field('current-research-image');


            if( !empty( $image ) ): ?>
            <div class="current-research-inner-right current-research-image-container">
                <div class="img-ratio-box img-treatment">
                 <div class="img-ratio-box-inside">
                        <img class="" src="<?php echo esc_url($image['url']); ?>">
                 </div>
                </div>
            </div>
            <?php endif; ?>
        </div>
    <?php
}

问题原因与修复方案 #

原因 #

$terms_funder_str数组没有在每个区块的循环中初始化。PHP中，数组变量如果不重新声明为空数组，会保留上一次循环的内容。每次遍历新的Research区块时，都会往同一个$terms_funder_str数组里追加当前区块的资助者，最终导致后面的区块包含前面所有区块的结果。而Researchers和Partners对应的$terms_author_str、$terms_partner_str都在各自的if判断内做了$xxx_str = array();的初始化，所以不会出现累加问题。

修复代码 #

只需在Funders的if判断内，先初始化$terms_funder_str为空数组：

$terms_funder = get_the_terms( $post->ID, 'funders' );

if ($terms_funder) {
    $terms_funder_str = array(); // 新增这行初始化代码
    echo '<p class="taxonomy-data"><strong>Funders </strong>';
        foreach($terms_funder as $term_funder) {
            $terms_funder_str[] = $term_funder->name;
        }
        echo implode(", ",$terms_funder_str);
}

内容的提问来源于stack exchange，提问作者samseurynck