如何在以编程方式创建帖子时向帖子中添加自定义字段？

我试图以编程方式创建一个post，并将一个值存储在直接从PhpMyAdmin创建的列中。

$post_title = $post->title->rendered;
$post_content = $post->content->rendered;

$post_check = get_page_by_title($post_title);
$post = array(
    \'post_type\' => \'post\',
    \'post_title\' => $post_title,
    \'post_content\' => $post_content,
    \'post_status\' => \'publish\',
    \'post_author\' => 1,
    \'post_slug\' => $post_title,
    \'post_imported_id\' => 3

);
$post_id = wp_insert_post($post);
if ($post_id) {
    add_post_meta( $post_id, \'post_imported_id\', 3 );
}

问题是没有考虑我的“post\\u imported\\u id”。