How to pass the necessary record to $post_id for the cron event and updating the update_post_meta fields according to the schedule?

Question

Task Schedulers

Good afternoon. How to get the post ID and update the update_post_meta entries on a schedule?

// регистрируем интервал 24 часа
add_filter( 'cron_schedules', 'cron_24' );
function cron_24( $schedules ) {
  $n = rand(0,55);
  $schedules['rand_24'] = array(
    'interval' => 60 * $n * 24,
    'display' => 'раз в сутки'
  );
  return $schedules;
}

// регистрируем событие 24_event
add_action( 'wp', 'to_cron_24' );
function to_cron_24() {
  if ( ! wp_next_scheduled( '24_event' ) ) {
    wp_schedule_event( time(), 'rand_24', '24_event');
  }
}

// добавляем функцию к хуку события
add_action( '24_event', 'updated_meta', 1 );

function updated_meta() {

    // какая-то задача, например ключевые слова
    $keywords = 'ключевые фразы для серии постов';

    update_post_meta( $post_id, 'allkeywords', $keywords );
}

When I enter a specific post id , it works, but when the parameter: $post_id does not work .

function updated_meta() {

    // какая-то задача, например ключевые слова
    $keywords = 'ключевые фразы для серии постов';

    update_post_meta( 34, 'allkeywords', $keywords ); // только так работает

    update_post_meta( $post_id, 'allkeywords', $keywords ); // так нет
    update_post_meta( $post->ID, 'allkeywords', $keywords ); // так нет
    update_post_meta( get_the_ID(), 'allkeywords', $keywords ); // так нет

add_action( '24_event', 'updated_meta', 1 );

$post = get_post(); // tried
global $post; // tried
global $wpdb; // tried

And more. For the usual updating of fields through save_post in the function, we write the function updated_meta ( $post_id ) parameter, but this does not work for the event.

Probably the ID is not defined with empty brackets function updated_meta ( ) , that is, the function does not understand for which specific post (record) to work.

How to get post ID and update custom 'allkeywords' field for all posts at once?

Answer 1

inside function updated_meta() write code to get the necessary $post_id from the database?
Google suggests that this is done through get_posts ()

$args = array(
  'numberposts' => 10,
  //'post_type'   => 'book'
);
 
$latest_posts = get_posts( $args );