Wordpress: change posts author programmatically

wp-change-posts-author.php

<?php
// don't forget to delete it or comment it out after using!
add_action( 'init', function(){
    $pids = [ 3439, 3214, 5370 ]; // change it
    $new_athor = 3; // change it
    foreach ( $pids as $pid ) {
        wp_update_post( [
            'ID' => $pid,
            'post_author' => $new_athor
        ] );
    }
} );