Wordpress On Edit Post 页面保存，更新 Post Meta

Question

我正在尝试 create/update post 元数据，当你 create/update 一个 post 是 post 类型的 "offer"。但是，它不会更新 post 元数据。此代码已添加到我的 functions.php 文件中。

add_filter( 'pre_post_update', 'update_voucher_deadline', 10, 2 );
function update_voucher_deadline( $post_id, $data ) { 
    $evergreen = get_field('offer_evergreen', $post_id);
    if ($evergreen == "evergreen-yes") {
        $year = date('Y');
        $month = date('m');
        $currentDate = "". $year . "-" . $month . "-" . date('d') . date('H') . ":" . date('i') . ":" . date('s');
        $day = date("t", strtotime($currentDate));
        $endOfMonth = "". $year . "-" . $month . "-" . $day . "23:59:00";

        //global $post; Tried with this uncommented and also didn't work.

        if ( ! add_post_meta($post_id, 'offer_voucher_deadline', $endOfMonth)) { 
            update_post_meta($post_id, 'offer_voucher_deadline', $endOfMonth);
        }
    }
}

Answer 1

首先，pre_post_update 钩子不会在创建时触发，它会在现有 post 更新之前立即触发。

您需要使用 save_post 挂钩，它会在创建或更新 post 或页面时触发

add_action( 'save_post', 'update_voucher_deadline', 10, 3 );
/**
 * Save post metadata when a post is saved.
 *
 * @param int $post_id The post ID.
 * @param post $post The post object.
 * @param bool $update Whether this is an existing post being updated or not.
 */
function update_voucher_deadline( $post_id, $post, $update ) { 
    $evergreen = get_field('offer_evergreen');
    if ($evergreen == "evergreen-yes") {
        $year = date('Y');
        $month = date('m');
        $currentDate = "". $year . "-" . $month . "-" . date('d') . date('H') . ":" . date('i') . ":" . date('s');
        $day = date("t", strtotime($currentDate));
        $endOfMonth = "". $year . "-" . $month . "-" . $day . "23:59:00";

        //global $post; Tried with this uncommented and also didn't work.

        if ( ! add_post_meta($post_id, 'offer_voucher_deadline', $endOfMonth)) { 
            update_post_meta($post_id, 'offer_voucher_deadline', $endOfMonth);
        }
    }
}

注意：如有必要，您可以使用 $update 参数更新函数。

Answer 2

我看到您使用 ACF 插件创建自定义字段，这意味着您可以使用 acf/save_post 过滤器来执行此操作。
1. 检查我们是否保存 post 输入 'offer'
2. 检查我们是否有自定义字段 'offer_evergreen' 和值 'evergreen-yes'
3. 检查我们是否有自定义归档 'offer_voucher_deadline' 如果是 - 更新他。
4. 如果我们没有custom filed 'offer_voucher_deadline' 创建他并保存我们的数据。

add_filter('acf/save_post', 'update_voucher_deadline', 20);
function update_voucher_deadline($post_id) {
    if ( get_post_type($post_id) != 'offer' ) //if current post type not equal 'offer' return
        return;

         $year = date('Y');
         $month = date('m');
         $currentDate = "". $year . "-" . $month . "-" . date('d') . date('H') . ":" . date('i') . ":" . date('s');
         $day = date("t", strtotime($currentDate));
         $endOfMonth = "". $year . "-" . $month . "-" . $day . "23:59:00";

    if ( get_field('offer_evergreen') == 'evergreen-yes' ) {

        if ( get_post_meta( $post_id, 'offer_voucher_deadline', true ) ) //If get post meta with key 'offer_voucher_deadline' - update meta
            update_post_meta($post_id, 'offer_voucher_deadline', $endOfMonth);
        else //else if do not have post meta with key 'offer_voucher_deadline' create post meta
            add_post_meta( $post_id, 'offer_voucher_deadline', $endOfMonth);

    } else {
        return; //Remove return and add what you want to save, if offer_evergreen not equal to evergreen-yes
    }
}

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