WordPress ACF 的 Checkbox 欄位資料轉移到 ACF Taxonomy 欄位

原先在 Post 上開了 post_must_read_department 欄位，想要轉移資料到新開的 read-department 欄位。

read-department 是 Taxonomy 分類法，所以我們會需要取得實際的分類法編號做更新

$posts = get_posts(['posts_per_page' => -1, 'fields' => 'ids']);

foreach ($posts as $post) {
    $departments = get_field('post_must_read_department', $post);

    $departments = array_map('strtolower', $departments);

    $terms = [];

    foreach ($departments as $department) {
        $terms[] = get_term_by('name', $department, 'read-department');
    }

    $terms = array_map(function ($term) { return $term->term_id; }, $terms);

    update_field('post_must_read_department_term', $terms, $post);   
}

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