下面是一个如何获取元数据并将其设置为帖子内容的示例。您需要将所有元键添加到$meta_fields 大堆

显然，在生产环境中运行之前，请在本地进行测试，因为它将覆盖帖子内容中当前的内容。

function migrate_post_data() {   
    // Add all the meta keys you want to migrate to this array.
    $meta_fields = array(
        \'flexible_content_1_content\',
        \'flexible_content_2_content\'
    );

    // Get all the posts.
    $args = array(
        \'post_type\'      => \'post\', // You may need to change this.
        \'posts_per_page\' => 400,
    );
    $posts = get_posts( $args );

    // Loop over each post.
    foreach ( $posts as $post )  {
        $meta_field_content = array();

        // Loop over each meta field and get their content, adding it to an array.
        foreach( $meta_fields as $meta_field ) {
            $content = get_post_meta( $post->ID, $meta_field, true );

            if ( ! empty( trim( $content ) ) ) {
                $meta_field_content[] = $content;
            }
        }

        if ( empty( $meta_field_content ) ) {
            continue;
        }

        // Set the the post content as whatever the meta fields were.
        $post_args = array(
            \'ID\' => $post->ID,
            \'post_content\' => implode( \' \', $meta_field_content ),
        );

        wp_update_post( $post_args );
    }
}