<?php
/**
 * Hromadná změna meta_value
 */
function bunch_meta_value_update($post_type = null, $posts_per_page = -1, $meta_key = null, $meta_value = null)
{
    $args = [];
    $args['post_type'] = $post_type;
    $args['posts_per_page'] = $posts_per_page;

    $posts = get_posts($args);

    foreach ($posts as $post) {

        update_post_meta( $post->ID, $meta_key, $meta_value);
        
    }
}
bunch_meta_value_update('turnaj', -1, 'zobrazit_v_archivu', 1  );