如何在我的后端Wordpress自定义类型页面上显示已检查的版本，但在数据库中我想看到变量名称

So I have to work with a wordpress function file. In this file I made a custom type called Series. I want to be able to check off genres of the series and save it in my database as the genre names separately and not as an array. I got it to show up and save as an array but I have no clue how to save them separately. I searched it and they all go back to the implode code but there are no good examples of how to use this.

Example checkbox:

function sps_add_custom_box(){
add_meta_box(
    'sps_genres_box_id',
    'Genres',
    'sps_custom_box_genre_html',
    'series');}

function sps_custom_box_genre_html($post){
    $value_action = get_post_meta($post->ID, '_genres_series', true);
    print("<input type='checkbox' name='Genres[]' id='Action' value='".$value_action."'></input>");
    print("<label for='Action'>Action </label>");}

add_action('add_meta_boxes', 'sps_add_custom_box');

function get_all_of_post_type( $type_name = ''){
$items = array();
if( !empty($type_name)){
    $args = array(
        'post_type' => "{$type_name}",
        'posts_per_page' => -1,
        'order' => 'ASC',
        'orderby' => 'title');
    $results = get_posts( $args );}
return $results;}