How can I add an object field to a post in Wordpress?

Question

WordPress

The essence of the question is that there is a post type "Match" and inside this type of post I need to have such a repeatable field as "Goals" and in this field I need to store values ​​like: "Player ID: Number of goals".
The question is, how is it possible to store the values ​​of such a field within a given post type? Is it possible to save objects inside a post? Or, in this case, will it be necessary to create another type of post (goal) and link it to the match?

Answer 1

Fields are used to store record data post_meta. It is most reasonable to store a string or an array in this field, but you can experiment with objects too

$competition['Барселона'][] = [
  'time' => '27:01',
  'person' => 'Месси',
];

$competition['ПСЖ'][] = [
  'time' => '32:16',
  'person' => 'Мбаппе',
];

$competition['ПСЖ'][] = [
  'time' => '70:44',
  'person' => 'Кин',
];

update_post_meta( $post_id, '_competition', $competition );

You can get the field value using the functionget_post_meta()

$competition = get_post_meta( $post_id, '_competition', true );