子比主题功能 – 为单个文章设置有效期，到期自动下线

文件路径：/wp-content/themes/zibll/func.php  添加如下代码。

（ 后台外观 - 主题文件编辑器 - func.php ）

后台发布文章页面会多出个 「文章有效期」 栏目。填写好到期时间发布即可！

//文章有效期 by• www.foxccs.com
CSF::createMetabox('post_validity_options', array(
    'title'     => '文章有效期',
    'post_type' => ['post', 'page', 'forum_post'],
    'context'   => 'side',
    'data_type' => 'unserialize',
));
CSF::createSection('post_validity_options', array(
    'fields' => array(
        array(
            'id'       => 'post_validity_time',
            'type'     => 'date',
            'desc'     => '设置内容的有效期，请确保格式正确，例如：<code>2020-10-10 23:59:59</code></br> 到期后将会自动删除此此内容',
            'settings' => array(
                'dateFormat'  => 'yy-mm-dd 23:59:59',
                'changeMonth' => true,
                'changeYear'  => true,
            ),
        ),
    ),
));

function zib_the_content_fore($content)
{
    $post_id = get_the_ID();
    $time    = get_post_meta($post_id, 'post_validity_time', true);

    if ($time) {
        $end_time = date("m/d/Y H:i:s", strtotime($time));
        $over     = '<script type="text/javascript">window.location.reload()</script>';
        $content  = '<div class="badg c-red block mb20"><i class="fa fa-clock-o mr10"></i> 当前内容将于<span class="" data-over-text="' . esc_attr($over) . '"  data-countdown="' . $end_time . '"></span> 后失效</div>' . $content;
    }

    return $content;
}
add_filter('the_content', 'zib_the_content_fore');

function zib_template_redirect_execute()
{
    if (is_single()) {
        $post_id = get_the_ID();
        $time    = get_post_meta($post_id, 'post_validity_time', true);

        if ($time && strtotime($time) < strtotime(current_time('Y-m-d H:i:s'))) {

            //执行删除文章
            wp_trash_post($post_id);

            wp_safe_redirect(home_url());
            exit;
        }

    }
}
add_action('template_redirect', 'zib_template_redirect_execute');